Integral Analysis of Heat Transfer on Falling Laminar Liquid Film with Constant Heat Flux

You Shun Peng; Li Yang; Yong Cheng Du

doi:10.4028/www.scientific.net/AMR.516-517.30

Paper Titles

Air Side Heat Transfer Characteristics of Wavy-Finned-Tube in a Forced Draft Direct Air-Cooled Steam Condenser
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Effect of Internal Helical Microfin on Condensation Performance of Two-Phase Closed Thermosyphon
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Effects of Micro-Particle Diameters and Low Fluid Velocities on Effective Thermal Parameters of Micro-Particle Packed Bed as a Biothermal Reactor
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Experiment Study on Unsteady Frosting of Cryogenic Vertical Plate Surface under Natural Convection Conditions
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Integral Analysis of Heat Transfer on Falling Laminar Liquid Film with Constant Heat Flux
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Modeling of Boiling Heat Transfer System and Chaos in Microchannel
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Numerical Simulation of Infrared Signature Emitted by Liquid Rocket Plume Using Wide Band K-Distribution Model
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A Three Dimensional Simulation of M-ICAR Process
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CFD Simulation of a SCWO Reactor Containing a Hydrothermal Flame
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Integral Analysis of Heat Transfer on Falling Laminar Liquid Film with Constant Heat Flux

Abstract:

Integral analysis of heat transfer of a laminar falling liquid film along a vertical heated plate with specified heat flux boundary condition was investigated. The temperature distribution of liquid film was obtained by utilizing an integral analysis method, which was compared with numerical solution and other researcher’s results. In this analysis a new concept of thermal changing point was put forward. It’s found that the Nusselt number has a characteristic relationship with thermal changing point, which is obtained by calculation. When the film flow distance is less than thermal changing point, the Nusselt number decreases rapidly. When the film flow distance is greater than or equal to thermal changing point, the Nusselt number reaches to a fixed value. A larger Peclet number or lower initial temperature generally leads to a larger Nusselt number in entrance region, whereas the wall heat flux is found to have no influence on the Nusselt number.