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Heat Transfer And Pressure Drop During Condensation Of Refrigerants In Microchannels
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Book Synopsis Heat Transfer and Pressure Drop During Condensation of Refrigerants in Microchannels by : Akhil Agarwal
Download or read book Heat Transfer and Pressure Drop During Condensation of Refrigerants in Microchannels written by Akhil Agarwal and published by . This book was released on 2006 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results from the current study thus make an important contribution to the understanding of pressure drop and heat transfer mechanisms during condensation in microchannels. The proposed model may be used by engineers for analyzing condensing two-phase flow in microchannels.
Book Synopsis Flow Regime Transitions During Condensation in Microchannels by : Gaurav Nema
Download or read book Flow Regime Transitions During Condensation in Microchannels written by Gaurav Nema and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Microchannel heat exchangers are widely used in air-conditioning and refrigeration systems, high heat flux electronics cooling, and are also being considered for biological devices. Heat transfer and pressure drop in microchannels with single-phase flow have been studied in greater detail compared to two-phase flow. Heat transfer and pressure drop in two-phase flow inside tubes are closely related to the structure of the flow. In convective condensation, the fluid flows in a variety of flow regimes as it changes from vapor to liquid. The flow patterns formed in microchannels differ in type and extent from those seen in conventional tubes. Wavy and stratified flows are virtually absent at microchannel dimension, while intermittent and annular flows predominate. The subject research focuses on understanding the flow physics in microchannels during condensation. The extensive condensation flow-regime database of a previous study is employed for this purpose. This database comprises the flow-regime observations in tubes of hydraulic diameter ranging from 1-4.91 mm during condensation of refrigerant R-134a. The mass flux ranges from 150-750 kg/m2-s over a vapor quality range of 0 to 1. The results from this previous experimental study are used to understand the physical mechanisms and the governing influences for each of the identified flow regimes. Using this understanding and data, criteria for transitions between the different regimes have been developed. These criteria developed in non-dimensional form can be utilized to identify the flow regimes and transitions for various fluids, operating conditions and channel sizes, thereby generalizing the applicability of these results. This mechanistic determination of condensation flow regimes in different operating conditions and geometries will assist in the choice of the appropriate models for the evaluation of heat transfer and pressure drop, and therefore enable the development of optimum microchannel heat exchangers.
Book Synopsis Evaporation and Condensation Heat Transfer and Pressure Drop in Horizontal, 12.7-mm Micro-fin Tubes with Refrigerant 22 by : L. M. Schlager
Download or read book Evaporation and Condensation Heat Transfer and Pressure Drop in Horizontal, 12.7-mm Micro-fin Tubes with Refrigerant 22 written by L. M. Schlager and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow boiling and condensation in microscale channels by : Fabio Toshio Kanizawa
Download or read book Flow boiling and condensation in microscale channels written by Fabio Toshio Kanizawa and published by Springer Nature. This book was released on 2021-04-30 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers aspects of multiphase flow and heat transfer during phase change processes, focusing on boiling and condensation in microscale channels. The authors present up-to-date predictive methods for flow pattern, void fraction, pressure drop, heat transfer coefficient and critical heat flux, pointing out the range of operational conditions that each method is valid. The first four chapters are dedicated on the motivation to study multiphase flow and heat transfer during phase change process, and the three last chapters are focused on the analysis of heat transfer process during boiling and condensation. During the description of the models and predictive methods, the trends are discussed and compared with experimental findings.
Book Synopsis Heat Transfer and Fluid Flow in Minichannels and Microchannels by : Satish Kandlikar
Download or read book Heat Transfer and Fluid Flow in Minichannels and Microchannels written by Satish Kandlikar and published by Elsevier. This book was released on 2006 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: &Quot;This book explores flow through passages with hydraulic diameters from about 1 [mu]m to 3 mm, covering the range of minichannels and microchannels. Design equations along with solved examples and practice problems are also included to serve the needs of practicing engineers and students in a graduate course."--BOOK JACKET.
Book Synopsis Effect of Oil on Heat Transfer and Pressure Drop Inside Augmented Tubes During Condensation and Evaporation of Refrigerants by : A. E. Bergles
Download or read book Effect of Oil on Heat Transfer and Pressure Drop Inside Augmented Tubes During Condensation and Evaporation of Refrigerants written by A. E. Bergles and published by . This book was released on 1985 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer and Pressure Drop During Condensation and Evaporation of R-134a/oil Mixtures in Smooth and Micro-fin Tubes by : M. B. Pate
Download or read book Heat Transfer and Pressure Drop During Condensation and Evaporation of R-134a/oil Mixtures in Smooth and Micro-fin Tubes written by M. B. Pate and published by . This book was released on 1990 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Oil on Heat Transfer and Pressure Drop During Evaporation and Condensation of Refrigerant Inside Augmented Tubes by : Lynn Michael Schlager
Download or read book The Effect of Oil on Heat Transfer and Pressure Drop During Evaporation and Condensation of Refrigerant Inside Augmented Tubes written by Lynn Michael Schlager and published by . This book was released on 1988 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Heat Transfer and Pressure Drop Characteristics of Refrigerants 134a and 12 During Condensation Inside Smooth and Internally Finned Tubes by : Paul E. Koops
Download or read book Comparison of Heat Transfer and Pressure Drop Characteristics of Refrigerants 134a and 12 During Condensation Inside Smooth and Internally Finned Tubes written by Paul E. Koops and published by . This book was released on 1992 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Oil on Heat Transfer and Pressure Drop Inside Augmented Tubes During Condensation and Evaporation of Refrigerants (RP-469) by : L. M. Schlager
Download or read book Effect of Oil on Heat Transfer and Pressure Drop Inside Augmented Tubes During Condensation and Evaporation of Refrigerants (RP-469) written by L. M. Schlager and published by . This book was released on 1989 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supercritical Gas Cooling and Near-critical-pressure Condensation of Refrigerant Blends in Microchannels by : Ulf Christian Andresen
Download or read book Supercritical Gas Cooling and Near-critical-pressure Condensation of Refrigerant Blends in Microchannels written by Ulf Christian Andresen and published by . This book was released on 2007 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical understanding and models resulting from this investigation provide the information necessary for designing and optimizing new components that utilize R410A for air-conditioning and heat pumping applications.
Download or read book Heat Transfer written by Salim Newaz Kazi and published by BoD – Books on Demand. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the wake of energy crisis due to rapid growth of industries, the efficient heat transfer could play a vital role in energy saving. Industries, household equipment, transportation, offices, etc., all are dependent on heat exchanging equipment. Considering this, the book has incorporated different chapters on heat transfer phenomena, analytical and experimental heat transfer investigations, heat transfer enhancement and applications.
Book Synopsis Void Fraction, Pressure Drop, and Heat Transfer in High Pressure Condensing Flows Through Microchannels by : Brendon Louis Keinath
Download or read book Void Fraction, Pressure Drop, and Heat Transfer in High Pressure Condensing Flows Through Microchannels written by Brendon Louis Keinath and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow mechanisms affect transport processes during condensation. Most studies on two-phase flow regimes are qualitative in nature, typically providing only information to guide the identification of the respective regimes and the transitions between them. These studies have, however, not yielded quantitative information to assist the development of pressure drop and heat transfer models. Such qualitative studies have also yielded results with considerable variability between investigators. A comprehensive investigation of flow mechanisms, void fraction, pressure drop and heat transfer during condensation of R404A in microchannels was conducted. In contrast to all prior investigations, high-speed video recordings and image analyses were used to directly measure void fraction, slug frequencies, vapor bubble velocity, vapor bubble dimensions and liquid film thicknesses in tube diameters ranging from 0.508 to 3.00 mm. Experiments were conducted at reduced pressures and mass fluxes ranging from 0.38 to 0.77 and 200 to 800 kg m-2 s-1, respectively, to document their influences on the condensation process at local vapor qualities ranging from 0 to 1. This information was used to develop a model for the void fraction in condensing flows. A complementing set of heat transfer and pressure drop measurements were conducted on the same geometries at similar conditions, and the void fraction model was used in conjunction with these measurements to develop improved heat transfer and pressure drop models. This comprehensive set of experiments and analyses yields a self-consistent and accurate treatment of high-pressure condensation in small hydraulic diameter geometries. Furthermore, the heat transfer model was found to agree well with condensing ammonia and carbon dioxide data that were obtained at significantly different conditions in different tube diameters. The added physical understanding of the condensation process and the models developed will serve as important building blocks for the design of microscale condensers and thermal systems.
Book Synopsis Heat Transfer and Pressure Drop During In-tube Evaporation and Condensation of Near-azeotropic Refrigerant Blends by : M. B. Pate
Download or read book Heat Transfer and Pressure Drop During In-tube Evaporation and Condensation of Near-azeotropic Refrigerant Blends written by M. B. Pate and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Condensation of Hfc-134a and Hfc-404a in a Smooth and Micro-Fin Tube by : Pradeep Patil
Download or read book Condensation of Hfc-134a and Hfc-404a in a Smooth and Micro-Fin Tube written by Pradeep Patil and published by LAP Lambert Academic Publishing. This book was released on 2011-03 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work was to study the condensation heat transfer and pressure drop characteristics ofHFC-134a in a micro-fined tube with an 18 degree helix angle and to compare them to those in a smooth tube for various operating conditions.The experimental test facility is designed, developed and is used to determine the condensation HTC and pressure drop in smooth and micro-fin tubes for various HFC refrigerants namely HFC-134a, R-404A, R-407C, R-507A. The experimentation covers wide range of operating parameters such as mass flux and condensing temperatures. The instrumentations used for measurements are calibrated from recognized calibration centres. The hermetically sealed compressor is used for circulating refrigerant; effect of oil present in the refrigerant during condensation is also taken into account. The condensation of HFC-134a and R-404A in smooth and micro-fin tubes are measured and obtained the values of condensation HTCs and pressure drops for different mass flux and condensing temperatures
Book Synopsis Heat, Mass, and Momentum Transfer for Flow Over a Flat Plate with Blowing Or Suction by : H. S. Mickley
Download or read book Heat, Mass, and Momentum Transfer for Flow Over a Flat Plate with Blowing Or Suction written by H. S. Mickley and published by . This book was released on 1954 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect on the boundary layer of sucking or blowing air through a porous flat plate into or out of a main air stream flowing parallel to the plate was studied theoretically and experimentally.
Book Synopsis Flow-pattern-based Heat Transfer and Pressure Drop Correlations for Condensing Refrigerants in Smooth Tubes by : Marcel Christians
Download or read book Flow-pattern-based Heat Transfer and Pressure Drop Correlations for Condensing Refrigerants in Smooth Tubes written by Marcel Christians and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The phase-out of ozone-depleting refrigerants, such as R-12 and R-22, according to the Montreal Protocol of 1987, has provided the incentive to increase the thermal efficiency of current heating and refrigeration systems. The purpose of this study was to increase the accuracy of the predictions of both the heat transfer and pressure drop correlations for condensing refrigerants in the Intermittent flow regime. This was done utilizing a novel method involving the temporal and spectral analysis of the light intensity of the local flow regime, as seen through a sight glass. An experimental setup was designed, built and commissioned specifically for this purpose using refrigerant R-22 and a smooth tube. It was found that the accuracy of the mean heat transfer coefficient predictions increased substantially compared to other leading correlations, particularly at low mass fluxes. In terms of the pressure drop, the predictions also increased in accuracy, and it was found that the time fraction method allows for continuous predictions over flow regime transitions when using local flow-pattern-based pressure drop models. This was previously not possible.
