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Impact Of Saltation On The Modeling Of Heat Transfer For High Reynolds Number Particle Laden Flows
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Book Synopsis Impact of Saltation on the Modeling of Heat Transfer for High Reynolds Number Particle-Laden Flows by : Zachary Vickerson
Download or read book Impact of Saltation on the Modeling of Heat Transfer for High Reynolds Number Particle-Laden Flows written by Zachary Vickerson and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The heat transfer performance of a particle-laden flow has design implications for a wide range of industries. The objective of this thesis is to improve a previously proposed Eulerian CFD model for the heat transfer of a highly mass loaded high Reynolds number particle-laden flow. Experimentation had shown that a layer of copper particles accumulated on the bottom of the flow channel. The previous two field (gas + dispersed particle) model was extended to include a third field to represent this particle layer. Mass transfer models were developed to account for the deposition of particles from dispersed to particle layer and from particle layer back to dispersed. New drag and heat transfer models were developed to account for the interaction of the particle layer field with the core gas flow. The model is tested and implemented using NPHASE, an Eulerian Multiphase flow CFD solver, and suggestions for improvement are proposed.
Book Synopsis EFFECT OF PARTICLE CONCENTRATION AND REYNOLDS NUMBER ON HEAT TRANSFER IN PARTICLE-LADEN FLOWS. by : Sarah Masters
Download or read book EFFECT OF PARTICLE CONCENTRATION AND REYNOLDS NUMBER ON HEAT TRANSFER IN PARTICLE-LADEN FLOWS. written by Sarah Masters and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research is to understand heat transfer in particle-laden flows. Particle-laden flows are prevalent in multiple industries, including chemical, pharmaceutical, plastics, food, and agriculture. In many applications, it is necessary to heat or cool the particle-laden flow to achieve desired process conditions. It is therefore important to understand the heat transfer characteristics of particle-laden flows under varying process conditions. This research seeks to experimentally investigate how the concentration of particles in turbulent, particle-laden flow effect the heat transfer properties of the flow. An experimental setup to observe the heat transfer properties of particle-laden flows was designed and built in house. A MARK XV-HP powder feeder system was used to entrain copper particles (-325 mesh) into a flow of nitrogen gas. The particle-laden flow then traveled through a horizontal pipe with a constant heat flux applied to the wall. Surface and fluid temperatures along the test section were measured and used to calculate the heat transfer coefficient and Nusselt number of the flow. A range of Reynolds numbers from 30,000 to 65,000 as well as a range of solids loadings from 0.0 to 1.0 were tested. For solids loadings of 0.5, the Nusselt number increased at lower Reynolds numbers and then decreased at higher Reynolds numbers. For solids loadings of 1.0, the Nusselt number was lower at low Reynolds numbers and then increased at higher Reynolds numbers. A transition in Nusselt number occurred for both solids loadings, but they occurred at different Reynolds numbers. The Nusselt number for particle-laden flows did show a variance from the Nusselt number for gas only flows. The direction and quantity of this difference was dependent on solids loading and Reynolds number. These trends are proposed to be a result of different turbulence modulation effects, which are discussed herein.
Book Synopsis Experiments on Equation of State Effects on Heat Transfer for High Reynolds Number, High Speed Flow and the Application to Throat Survivability by : Fangfang Jiang
Download or read book Experiments on Equation of State Effects on Heat Transfer for High Reynolds Number, High Speed Flow and the Application to Throat Survivability written by Fangfang Jiang and published by . This book was released on 2004 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Temperature Coupling Effects in Radiatively Heated Particle-laden Flows by : Ji Hoon Kim
Download or read book Temperature Coupling Effects in Radiatively Heated Particle-laden Flows written by Ji Hoon Kim and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent particle-laden flows are common in many natural phenomena and engineering applications. While particle-laden turbulence is a relatively well-studied subject, not many studies address the concurrent effect of an radiative heat transfer on the multiphase system. Understanding such an interaction can be key to designing effective spray combustors, fire suppression systems, and particle solar receivers. Using the particle solar receiver as a test bed for investigation, this work aims to experimentally investigate the coupling between radiation, turbulence, and particles in such a system using two different flow configurations of a duct flow and an isokinetic co-flowing jet. The goals of the work are to examine the effects of preferential concentration on the behavior of the radiation transport through the disperse medium and the convective heat transfer between the carrier and disperse phase. In addition, it also aims to study the converse effect of how the radiative heating can effect the clustering behavior of the particles by examining measures of preferential concentration of particles in the flow in the presence of radiative heating. The study finds that the preferential concentration of particles can cause the radiation transmission to deviate from a classical Beer's Law extinction behavior, due to increased line of sight distances in the medium. Measurements of the carrier phase temperature statistics show that large coherent particles clusters dominate the modulation of the gas phase temperature, especially in the boundary layer in wall-bounded flows. Measurements of the radial distribution function, clustering index, and Voronoi cell area PDFs all indicated a reduction of preferential concentration within clusters, particularly in denser clusters with smaller associated separation length scales, which correspond to the most intensely heated regions of the flow. Particle velocity statistics showed evidence of bulk turbulence modification by radiative heating, as particle velocity fluctuations were dampened. This was likely caused by variable property effects from temperature-dependent properties, specifically from the increase in fluid kinematic viscosity. Buoyancy and dilatation effects were identified as possible mechanisms for turbulence modification at the smaller cluster scales, supported by scaling analyses and directional measures of preferential concentration.
Book Synopsis Analysis of Heat Transfer, Burnout, Pressure Drop and Density Data for High-pressure Water by : W. H. Jens
Download or read book Analysis of Heat Transfer, Burnout, Pressure Drop and Density Data for High-pressure Water written by W. H. Jens and published by . This book was released on 1955 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Resonant Vibrations on Heat Transfer at High Reynolds Numbers Final Report by : Thomas Woodrow Jackson
Download or read book The Effects of Resonant Vibrations on Heat Transfer at High Reynolds Numbers Final Report written by Thomas Woodrow Jackson and published by . This book was released on 1961 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer and Pneumatic Effects of Particle-laden Flow Through Curved Pipes by : Connor Bradley
Download or read book Heat Transfer and Pneumatic Effects of Particle-laden Flow Through Curved Pipes written by Connor Bradley and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this thesis is to understand the effect of pipe curvature on heat transfer inparticle-laden flow. Extensive research has been conducted on fluid flow with particleentrainment, providing a strong foundation for understanding the parallel between theoreticalmodels and experimental results. The thesis begins by providing insight into previous research toexhibit the reasoning of conducting this new research. Then, it discusses the experimentalmethods used to entrain particles in a gaseous flow through a heat exchanger and the proceduresto gather data from this system. In these experimental tests, nitrogen gas is flowed through halfinchdiameter stainless steel piping and entrained with copper powder. Heat tape is used to heatthe test sections and provide a constant heat flux boundary condition for heat transfer. Analysisof the experimental data showed trends that curvature increased the Nusselt number by up to300% in some cases compared to the equivalent straight-pipe experiment. Further, for a curvedheat exchanger, the heat transfer was higher along the outer curve of the pipe compared the innercurve, likely due to secondary flow effects. Finally, the presence of the particles in gaseous flowincreased the heat transfer in the system compared to gas-only flow, as evidenced by thedecreased temperature differences between the wall temperatures and the bulk flowtemperatures. The present research suggests significant heat transfer benefits are possible withcurved-pipe, particle-laden flows.
Book Synopsis Effect of Heat Transfer on Flow Field at Low Reynolds Numbers in Vertical Tubes by : Edward Marshall Rosen
Download or read book Effect of Heat Transfer on Flow Field at Low Reynolds Numbers in Vertical Tubes written by Edward Marshall Rosen and published by . This book was released on 1959 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Toward an Understanding of the Breakdown of Heat Transfer Modeling in Reciprocating Flows by : Ian Pond
Download or read book Toward an Understanding of the Breakdown of Heat Transfer Modeling in Reciprocating Flows written by Ian Pond and published by . This book was released on 2015 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reynolds average Navier-Stokes (RANS) modeling has established itself as a critical design tool in many engineering applications, thanks to its superior computational efficiency. The drawbacks of RANS models are well known, but not necessarily well understood: poor prediction of transition, non-equilibrium flows, mixing and heat transfer, to name the ones relevant to our study. In the present study, we use a direct numerical simulation (DNS) of a reciprocating channel flow driven by an oscillating pressure gradient to test several low- and high-Reynolds' RANS models. Temperature is introduced as a passive scalar to study heat transfer modeling. Low-Reynolds' models manage to capture the overall physics of wall shear and heat flux well, yet with some phase discrepancies, whereas high-Reynolds' models fail. We have derived an integral method for wall shear and wall heat flux analysis, which reveals the contributing terms for both metrics. This method shows that the qualitative agreement appears more serendipitous than driven by the ability of the models to capture the correct physics. The integral method is shown to be more insightful in the benchmarking of RANS models than the typical comparisons of statistical quantities. This method enables the identification of the sources of discrepancies in energy budget equations. For instance, in the wall heat flux, one model is shown to have an out of phase dynamic behavior when compared to the benchmark results, demonstrating a significant issue in the physics predicted by this model. Our study demonstrates that the integral method applied to RANS modeling yields information not previously available that should guide the derivation of physically more accurate models.
Book Synopsis Heat Transfer in Turbulent Flow by : Eric Kenneth Johnson
Download or read book Heat Transfer in Turbulent Flow written by Eric Kenneth Johnson and published by . This book was released on 1967 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of Similar Solutions to Calculation of Laminar Heat Transfer on Bodies with Yaw and Large Pressure Gradient in High-speed Flow by : Ivan E. Beckwith
Download or read book Application of Similar Solutions to Calculation of Laminar Heat Transfer on Bodies with Yaw and Large Pressure Gradient in High-speed Flow written by Ivan E. Beckwith and published by . This book was released on 1961 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of the Use of Acoustic Vibrations to Improve Heat Transfer Rates and Reduce Scaling in Distillation Units Used for Saline Water Conversion by : Southwest Research Institute
Download or read book Investigation of the Use of Acoustic Vibrations to Improve Heat Transfer Rates and Reduce Scaling in Distillation Units Used for Saline Water Conversion written by Southwest Research Institute and published by . This book was released on 1962 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Extraction from the ANL Research Salt Gradient Solar Pond by : John R. Hull
Download or read book Heat Extraction from the ANL Research Salt Gradient Solar Pond written by John R. Hull and published by . This book was released on 1986 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of both heat extraction methods on the stability of the salt gradient are investigated.
Book Synopsis Heat Transfer in low Reynolds number flow by :
Download or read book Heat Transfer in low Reynolds number flow written by and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling the Effect of Pulsation on Flow and Heat Transfer in Turbulent Separated and Reattaching Flows by : Parham Momeni
Download or read book Modelling the Effect of Pulsation on Flow and Heat Transfer in Turbulent Separated and Reattaching Flows written by Parham Momeni and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer to Turbulent Boundary Layers in High Velocity Flow by : Ralph Alois Seban
Download or read book Heat Transfer to Turbulent Boundary Layers in High Velocity Flow written by Ralph Alois Seban and published by . This book was released on 1948 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
