Publicado 6 números por año
ISSN Imprimir: 1940-2503
ISSN En Línea: 1940-2554
Indexed in
SPLITTING THE CONTRIBUTIONS OF VELOCITY AND VELOCITY GRADIENT TO THE TRANSPORT OF HEAT FLUX IN LAMINAR CONVECTION THROUGH A SQUARE DUCT WITH UNIFORM WALL TEMPERATURE
SINOPSIS
The convective heat transfer process can be described through a process parameter, heat flux defined by Fourier's law, which results in the convective transport equation of heat flux. To find more support for the efficiency of using a heat flux transport equation, this paper (i) reports the heat flux transport equation in more a general convective heat transfer case, (ii) discusses conservation of heat flux on a control volume, and (iii) splits contributions of velocity and velocity gradient to the transport of heat flux in laminar convection through a square duct with uniform wall temperature. The main results can be summarized as follows. In a more general case, the transport equation of heat flux has source terms related to the gradient of thermal conductivity, the difference of thermal conductivity with respect to time, and the gradient of (ρcp) or (ρc). Furthermore, the volumetric integrations of the diffusion term and the convection term caused by velocity are related to integrations of fluxes through the boundaries of a control volume; other terms are the volumetric sources of the conserved quantity. Third, for laminar convection through a square duct, the contributions of velocity and velocity gradient to the convective transport of heat flux can be split.
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Zhang Qiang, Wang Liang-Bi, The Reasons of Heat Transfer Enhancement in a Laminar Channel Flow With Uniform Heat Flux on the Wall Under a Pair of Longitudinal Vortex Generators Mounted on the Bottom Wall, Journal of Heat Transfer, 139, 12, 2017. Crossref