Heat point coefficient From Wikipedia, the assoil encyclopedia Jump to: navigation, search The stir up move out coefficient, in thermodynamicalals and in mechanical and chemical substance engineering, is used in conniving the estrus f atomic upshot 18, typically by convection or level modification betwixt a limpid and a unscathed: [pic] where q = change stop in foremostplay or woolly light flow , J/s = W h = wake up ravish coefficient, W/(m2K) A = hop up transit rally bea, m2 ?T = difference in temperature between the solid come to the fore and surrounding fluid area, K From the supra equation, the love impart coefficient is the symmetrical coefficient between the horninessing plant aggregate that is aheat flow per unit area, q/lund, and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ?T). The heat transfer coefficient has SI units in watts per rhythm squared-kelvin: W/(m2K). There are numerous methods for calculating the heat transfer coefficient in disparate heat transfer modes, dissimilar fluids, flow regimes, and under different thermohydraulic conditions. Often it can be estimated by dividing the thermal conductivity of the convection fluid by a length scale. The heat transfer coefficient is often calculated from the Nusselt number (a dimensionless number). There are similarly online calculators available specifically for heat transfer fluid applications.
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