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The Effect Of Condensate Inundation On Steam Condensation Heat Transfer In A Tube Bundle
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Book Synopsis The Effect of Condensate Inundation on Steam Condensation Heat Transfer in a Tube Bundle by : S. K. Brower
Download or read book The Effect of Condensate Inundation on Steam Condensation Heat Transfer in a Tube Bundle written by S. K. Brower and published by . This book was released on 1985 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam-condensation heat-transfer measurements were made using a 5-tube in-line test condenser with an additional perforated tube to simulate up to 30 active tubes. Results were obtained for smooth tubes wire-wrapped tubes and dropwise-coated tubes. The average outside heat-transfer coefficient for 30 smooth tubes was 0.64 times the Nusselt coefficient fo the first tube. A total of eight wire-diameter and wire-pitch combinations were tested: 1.6-mm-diameter wire wrapped at 16 mm, 7.6 mm and 4 mm wire pitches, 1.0-mm-diameter wire wrapped at 8 mm, 4 mm and 2 mm wire pitches, and 0.5-mm-diameter wire wrapped at 4 and 2 mm wire pitches. The best bundle performance was obtained when the tubewere wrapped with 1.0-mm-diameter wire at a wire pitch of 4 mm. This combination resulted in an average outside heat-transfer coefficient for 30 tubes that was 1.15 times the value computed for the first time using the Nusselt theory. The average outside heat-transfer coefficient for 30 dropwise-coated tubes was 1.1 times the value of the heat-transfer coefficient for the first tube in the tube bundle. Using either wire-wrapped tubes or dropwise-coated tubes, it is possible to significantly reduce the condenser surface area and overall size. Keywords: Inundation, Smooth, wire-wrapped tubes. (Theses).
Book Synopsis The Effect of Condensate Inundation on Condensation Heat Transfer in Tube Bundles of Marine Condensers by :
Download or read book The Effect of Condensate Inundation on Condensation Heat Transfer in Tube Bundles of Marine Condensers written by and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments, under different conditions, were conducted to evaluate the effect of condensate inundation on condensation heat transfer in tube bundles of marine condensers. Five 15.9 mm. (5/8 in) nominal outside diameter, smooth stainless steel tubes were used in a vertical row to simulate an actual condenser. Tubes were located in an equilaterial triangular array with a spacing-to-diameter ratio of 1.5. Heat transfer performance was determined for each tube in bundle. Data was taken for condensing steam on the outside of each tube at about 21 KPa (3 psia) and at about 101 KPa (14.7 psia). Each tube was cooled by water on the inside at velocities of 0.78 to 6.22 m/sec (2.56 ft/sec to 20.42 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the first three tubes in portions of the condenser under all conditions tested. Side drainage occurred only over the third and fourth tubes at a condensation pressure of about 21 KPa. The dominate mode of the flow at 101 KPa condensation pressure was gravitational flow. Outside heat transfer coefficients were higher than expected under all conditions when compared to the Nusselt theory. The reason for this is possibly due to secondary vapor flow. Recommendations to improve validations are provided. (Author).
Book Synopsis The Effect of Condensate Inundation on Steam Condensation Heat Transfer to Wire-Wrapped Tubing by :
Download or read book The Effect of Condensate Inundation on Steam Condensation Heat Transfer to Wire-Wrapped Tubing written by and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam condensation heat transfer measurements were made in a 5-tube test condenser having an additional perforated tube to simulate up to 30 active tubes. Results were obtained for smooth tubes and roped tubes wrapped with wire. A Sieder-Tate equation was used to correlate the inside heat-transfer coefficient. For smooth tubes, a leading coefficient of 0.029 was found, while it was 0.061 for the roped tubes. The average condensing coefficient measured for 30 smooth tubes was 0.59 times the Nusselt coefficient calculated for the first tube. When the smooth tubes were wrapped with wire, this ratio increased up to 0.86. Further, roped tubes without wire experienced a ratio of 0.63, while roped tubes wrapped with wire resulted in a ratio of 0.86. These preliminary data show that wire-wrapped tubes may lead to a significant reduction in condenser surface area. (Author).
Book Synopsis The Effect of Condensate Inundation on Condensation Heat Transfer in Tube Bundles of Marine Condensers by : Ismail Demirel
Download or read book The Effect of Condensate Inundation on Condensation Heat Transfer in Tube Bundles of Marine Condensers written by Ismail Demirel and published by . This book was released on 1980 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments, under different conditions, were conducted to evaluate the effect of condensate inundation on condensation heat transfer in tube bundles of marine condensers. Five 15.9 mm. (5/8 in) nominal outside diameter, smooth stainless steel tubes were used in a vertical row to simulate an actual condenser. Tubes were located in an equilaterial triangular array with a spacing-to-diameter ratio of 1.5. Heat transfer performance was determined for each tube in bundle. Data was taken for condensing steam on the outside of each tube at about 21 KPa (3 psia) and at about 101 KPa (14.7 psia). Each tube was cooled by water on the inside at velocities of 0.78 to 6.22 m/sec (2.56 ft/sec to 20.42 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the first three tubes in portions of the condenser under all conditions tested. Side drainage occurred only over the third and fourth tubes at a condensation pressure of about 21 KPa. The dominate mode of the flow at 101 KPa condensation pressure was gravitational flow. Outside heat transfer coefficients were higher than expected under all conditions when compared to the Nusselt theory. The reason for this is possibly due to secondary vapor flow. Recommendations to improve validations are provided. (Author).
Book Synopsis The Effect of Condensate Inundation on Steam Condensation Heat Transfer to Wire-Wrapped Tubing by : Georgios Dimitriou Kanakis
Download or read book The Effect of Condensate Inundation on Steam Condensation Heat Transfer to Wire-Wrapped Tubing written by Georgios Dimitriou Kanakis and published by . This book was released on 1983 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam condensation heat transfer measurements were made in a 5-tube test condenser having an additional perforated tube to simulate up to 30 active tubes. Results were obtained for smooth tubes and roped tubes wrapped with wire. A Sieder-Tate equation was used to correlate the inside heat-transfer coefficient. For smooth tubes, a leading coefficient of 0.029 was found, while it was 0.061 for the roped tubes. The average condensing coefficient measured for 30 smooth tubes was 0.59 times the Nusselt coefficient calculated for the first tube. When the smooth tubes were wrapped with wire, this ratio increased up to 0.86. Further, roped tubes without wire experienced a ratio of 0.63, while roped tubes wrapped with wire resulted in a ratio of 0.86. These preliminary data show that wire-wrapped tubes may lead to a significant reduction in condenser surface area. (Author).
Book Synopsis An Experimental Investigation of the Effect of Condensate Inundation on Heat-Transfer in a Horizontal Tube Bundle by : Donald Eugene Eshleman
Download or read book An Experimental Investigation of the Effect of Condensate Inundation on Heat-Transfer in a Horizontal Tube Bundle written by Donald Eugene Eshleman and published by . This book was released on 1980 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: A test facility to evaluate the effect of condensate inundation on heat transfer within a horizontal tube bundle was designed, constructed and validated. Five 15.9 mm (5/8 in.) nominal outside diameter, smooth stainless steel tubes were utilized in a vertical row. They were located in an equilateral triangular array with a spacing to diameter ratio of 1.5. Heat transfer performance was determined for each tube in the bundle. Data was taken by condensing steam at about 21 kPa (3 psia) on the outside of each tube. Each tube was cooled by water on the inside at velocities of 0.78 to 7.0 m/sec (2.56 to 23 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the tube in portions of the condenser as well as side drainage, particularly over the first three tubes. Outside heat transfer coefficients were lower than expected when compared to Nusselt theory, possibly due to the effects of secondary vapor flow and/or non-condensable gases. Recommendations to improve validation are provided. (Author).
Book Synopsis An Experimental Investigation of the Effect of Condensate Inundation on Heat-Transfer in a Horizontal Tube Bundle by :
Download or read book An Experimental Investigation of the Effect of Condensate Inundation on Heat-Transfer in a Horizontal Tube Bundle written by and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A test facility to evaluate the effect of condensate inundation on heat transfer within a horizontal tube bundle was designed, constructed and validated. Five 15.9 mm (5/8 in.) nominal outside diameter, smooth stainless steel tubes were utilized in a vertical row. They were located in an equilateral triangular array with a spacing to diameter ratio of 1.5. Heat transfer performance was determined for each tube in the bundle. Data was taken by condensing steam at about 21 kPa (3 psia) on the outside of each tube. Each tube was cooled by water on the inside at velocities of 0.78 to 7.0 m/sec (2.56 to 23 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the tube in portions of the condenser as well as side drainage, particularly over the first three tubes. Outside heat transfer coefficients were lower than expected when compared to Nusselt theory, possibly due to the effects of secondary vapor flow and/or non-condensable gases. Recommendations to improve validation are provided. (Author).
Book Synopsis Effects of Condensate Inundation and Vapor Velocity on Heat Transfer in a Condenser Tube Bundle by : Paul Jeffrey Noftz
Download or read book Effects of Condensate Inundation and Vapor Velocity on Heat Transfer in a Condenser Tube Bundle written by Paul Jeffrey Noftz and published by . This book was released on 1982 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: A five-tube column test condenser was modified to facilitate easier tube removal and installation and to allow for the simulation of larger depth tube bundles. Heat transfer coefficients were then determined for sixty-two runs conducted at steam supply pressures of 35, 40, 45, and 50 psig with the system operated at test condenser pressures of approximately 2 and 15 psia. Each run was five minutes long with temperature, pressure, and flow rate data taken at one minute intervals. The results revealed that the average tube wall temperature and the heat transfer coefficients for a given tube of a tube bundle increased as the mean vapor velocity increased, but decreased as the amount of condensate inundation increased. The experimentally obtained values for the heat transfer coefficients were compatible with the Nusselt predictions for the runs conducted at 15 psia, but greatly exceeded the Nusselt predictions for the runs conducted at 2 psia. However, for the 2 psia runs, the heat transfer coefficients for the top tubes agreed closely with an experimental correlation proposed by Fujii. The simulation of a tube bundle of more than five active tubes per column at the 2 psia test condenser pressure demonstrated heat transfer coefficients closer to the Nusselt theory than when only five active tubes were considered.
Book Synopsis Condensation Heat Transfer Enhancement by : V. G. Rifert
Download or read book Condensation Heat Transfer Enhancement written by V. G. Rifert and published by WIT Press (UK). This book was released on 2004 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: In processes with condensation of steam-to-gas compositions or refrigerative agents an intensification of condensation is often required because thermal resistance on the condensation side can be greater than the thermal resistance of the heat transfer wall on the cooling side. In this work, a pair of researchers from the National Technical U. of Ukraine and the State Academy of Refrigeration (Ukraine) provide information about the enhancement of condensation, including research results from the former USSR they feel deserves wider dissemination as well as discussion of different theoretical models of the condensation process. The US office of WIT Press is Computational Mechanics. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).
Book Synopsis Heat Transfer in Condensation and Boiling by : Samson Semenovich Kutateladze
Download or read book Heat Transfer in Condensation and Boiling written by Samson Semenovich Kutateladze and published by . This book was released on 1959 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Condensation on Performance and Design of Extended Surfaces by :
Download or read book Effect of Condensation on Performance and Design of Extended Surfaces written by and published by DIANE Publishing. This book was released on with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation Heat Transfer by : P. J. Marto
Download or read book Condensation Heat Transfer written by P. J. Marto and published by . This book was released on 1979 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensers, Theory and Practice by : David Butterworth
Download or read book Condensers, Theory and Practice written by David Butterworth and published by Thomas Telford Publishing. This book was released on 1983 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer in Condensation and Boiling by : Karl Stephan
Download or read book Heat Transfer in Condensation and Boiling written by Karl Stephan and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: I welcome the opportunity to have my book translated, because of the great emphasis on two-phase flow and heat transfer in the English-speaking world, as related to research, university education, and industrial practice. The 1988 Springer-Verlag edition of "Warmeiibergang beim Kondensieren und beim Sieden" has been enlarged to include additional material on falling film evaporation (Chapter 12) and pressure drop in two-phase flow (Chapter 13). Minor errors in the original text have also been corrected. I would like to express my sincere appreciation to Professor Green, Asso ciate Professor of German at Rensselaer, for his excellent translation and co operation. My thanks go also to Professor Bergles for his close attention to technical and linguistic details. He carefully read the typescript and made many comments and suggestions that helped to improve the manuscript. I hope that the English edition will meet with' a favorable reception and contribute to better understanding and to progress in the field of heat transfer in condensation and boiling. February 1992 K. Stephan Preface to the German-Language Edition This book is a continuation of the series "Heat and Mass Transfer" edited by U. Grigull, in which three volumes have already been published. Its aim is to acquaint students and practicing engineers with heat transfer during condensa tion and boiling, and is intended primarily for students and engineers in mechanical, chemical, electrical, and industrial processing engineering.
Book Synopsis Convective Boiling and Condensation by : John G. Collier
Download or read book Convective Boiling and Condensation written by John G. Collier and published by Clarendon Press. This book was released on 1994-05-19 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Third edition of a well-known and well established text both in industry and for teaching * Fully up-to-date and includes extra problems This book is an aid to heat exchanger design written primarily for design and development engineers in the chemical process, power generation, and refrigeration industries. It provides a comprehensive reference on two-phase flows, boiling, and condensation. The text covers all the latest advances like flows over tube bundles and two-phase heat transfer regarding refrigerants and petrochemicals. Another feature of this third edition is many new problems at chapter ends to enhance its use as a teaching text for graduate and post-graduate courses on two-phase flow and heat transfer. - ;This book is written for practising engineers as a comprehensive reference on two-phase flows, boiling, and condensation. It deals with methods for estimating two-phase flow pressure drops and heat transfer rates. It is a well-known reference book in its third edition and is also used as a text for advanced university courses. Both authors write from practical experience as both are professional engineers. -
Book Synopsis Experimental Measurements of the Effects of Steam Velocity and Inundation on Condensation Heat Transfer by : A. A. Butcher
Download or read book Experimental Measurements of the Effects of Steam Velocity and Inundation on Condensation Heat Transfer written by A. A. Butcher and published by . This book was released on 1972 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 28 (thesis year 1 983) a total of 10,661 theses titles from 26 Canadian and 197 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 28 reports theses submitted in-1983, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
