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Channel Size Influence on the Heat Flux Density at Zero Net Mass Flow in the Non-Linear Transport Regime Between 1.2 K and 2.1 K
T.H.K. Frederking, S.W.K. Yuan, J.M. Lee, and G.S. Sun
University of California, Los Angeles
Chemical Engineering Dept.
Los Angeles, CA 90024, U.S.A.
The technology of phase separators, and devices using thermomechanical forces, established by a temperature (T) gradient in He II, has been extended to smaller and smaller pore sizes of porous media. The work on phase separators has had the following results: 1. The normal fluid flow and related entropy and heat convection rates are controlling quantities in the relatively large pores of the IRAS type technology; 2. The convective rate of normal fluid in most data sets, reported in the literature up to this time, has been in the non-linear regime; 3. The usual "rate constant" (Gorter-Mellink constant), associated with non-linear flow, has been found to vary with the pore size. The constant appears to be proportional to the square root of the Darcy permeability (KDn).
As these results have been emerging in very recent time, the immediate question arising in this context is whether the entropy / heat convection rate at zero net mass flow (ZNMF) have the same type of pore size influence as in vapor-liquid phase separation (VLPS)? The present paper has the purpose of investigating this question for porous media and for fine ducts of simple shape at ZNMF. Basic equations are discussed, and experimental data are compared to VLPS prediction. Further, conclusions are presented. Download this Paper
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About the author- Dr. Sidney Yuan is a consultant in the field of Low Temperature Physics and Cryogenics, and has written a Book on Cryogenics and published extensively in the field. E-Mail.
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