Review on thermal energy storage with phase change: materials, heat transfer analysis and applications

The boundary layer equations for plane, incompressible, and steady flow are 

$$\matrix{ {u{{\partial u} \over {\partial x}} + v{{\partial u} \over {\partial y}} = - {1 \over \varrho }{{\partial p} \over {\partial x}} + v{{{\partial ^2}u} \over {\partial {y^2}}},} \cr {0 = {{\partial p} \over {\partial y}},} \cr {{{\partial u} \over {\partial x}} + {{\partial v} \over {\partial y}} = 0.} \cr }$$

Boundary Layer Theory

An introduction to heat transfer

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Numerical Heat Transfer And Fluid Flow

This paper explores the recent research developments in high-heat-flux thermal management. Cooling schemes such as pool boiling, detachable heat sinks, channel flow boiling, microchannel and mini-channel heat sinks, jet-impingement, and sprays, are discussed and compared relative to heat dissipation potential, reliability, and packaging concerns. It is demonstrated that, while different cooling options can be tailored to the specific needs of individual applications, system considerations always play a paramount role in determining the most suitable cooling scheme. It is also shown that extensive fundamental electronic cooling knowledge has been amassed over the past two decades. Yet there is now a growing need for hardware innovations rather than perturbations to those fundamental studies. An example of these innovations is the cooling of military avionics, where research findings from the electronic cooling literature have made possible the development of a new generation of cooling hardware which promise order of magnitude increases in heat dissipation compared to today's cutting edge avionics cooling schemes.

Assessment of high-heat-flux thermal management schemes

The compression process in a piston cylinder devic e in a Compressed Air Energy Storage (CAES) system is studied computationally. Twelve different cases featuring f our different compression space length-to-radius aspect ratios an d three different Reynolds numbers are studied computationally using the commercial CFD code ANSYS FLUENT. The solutions show that for compression with a constant velocity, the compression can be approximated by a polytropic pressure vs. volume relation. The polytropic exponent, �, characterizes the heat transfer and temperature rise of the air being compressed. For the cases computed, it varies from 1.124 to 1.3 05 and is found to be more affected by Reynolds number and less by the length-to-radius ratio. Since the efficiency and st orage power of the compressor depend on pressure vs. volume trajec tory during compression, they are written as functions of the p ressure rise ratio and the polytropic exponent, �. The efficiency is high at the beginning of the compression process, and decre ases as the compression proceeds. The effect of temperature ris e, or heat transfer, on efficiency and storage power is shown by comparing the efficiency and storage power vs. volume curves having

Storage Power and Efficiency Analysis Based on CFD for Air Compressors Used for Compressed Air Energy Storage

Measurements were made of the heat transfer rate through turbulent and transitional boundary layers on an isothermal, convexly curved wall and downstream flat plate The effect of convex curvature on the fully turbulent boundary layer was a reduction of the local Stanton numbers 20% to 50% below those predicted for a flat wall under the same circumstances The recovery of the heat transfer rates on the downstream flat wall was extremely slow After 60 cm of recovery length, the Stanton number was still typically 15% to 20% below the flat wall predicted value Various effects important in the modeling of curved flows were studied separately These are: the effect of initial boundary layer thickness, the effect of freestream velocity, the effect of freestream acceleration, the effect of unheated starting length, and the effect of the maturity of the boundary layer An existing curvature prediction model was tested against this broad heat transfer data base to determine where it could appropriately be used for heat transfer predictions

Turbulent boundary layer heat transfer experiments: Convex curvature effects, including introduction and recovery

Heat transfer — a review of 1988 literature

In this study, four novel film cooling hole designs, all based on cylindrical holes, are numerically evaluated, and compared with those of a simple cylindrical hole and a laterally-diffused shaped ...

Terrence W. Simon

Papers

Storage Power and Efficiency Analysis Based on CFD for Air Compressors Used for Compressed Air Energy Storage

Turbulent boundary layer heat transfer experiments: Convex curvature effects, including introduction and recovery

Heat transfer — a review of 1988 literature

Influence on film cooling effectiveness of novel holes based on cylindrical configurations

High-heat-flux forced convection boiling from small regions