Basic Theory for Heat Exchanger Calculation (2) – Pseudohomogeneous Theory of Gas-Liquid Mixed Flow
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This post was last edited by wiseboy on 2012-1-10 21:05. In a gas-liquid mixed phase, thorough mixing occurs during flow; the quasi-thermal conductivity, also known as apparent thermal conductivity, and the average thermal conductivity λm are given by: 1/λm = xg/λg + (1-xg)/λl, or alternatively: λm = λgλl. Where: xg is the volume fraction of the gas phase; λg is the thermal conductivity of the gas phase, in W/(m·K); λl is the thermal conductivity of the liquid phase, in W/(m·K). In this way, the gas-liquid two-phase flow can be approximated as a single-phase fluid, though other physical properties also need to be adjusted accordingly. Statement: This is the work of Wiseboy. If you wish to reproduce it, please indicate “Haichuan Forum Wiseboy Thermal Conductivity””
Can it be done this way? Did the original poster create it themselves or cite it? Is this used for hybrid heat exchangers?
This is an obvious citation; these formulas have to be derived through countless experiments, otherwise there would be no basis for their use.
This post was last edited by omexfds on 2015-2-14 at 16:29. Is this similar to calculating viscosity using McAdam’s formula? However, in McAdam’s formula, xg refers to the mass fraction in the gas phase.
Could you tell me the source of this formula for calculating thermal conductivity?