![]() ![]() In this case, the heat transfer coefficients would be the same as for a single flat plate. Vertically oriented array of parallel flat plates.If the plates are spaced far enough apart, the natural convection boundary layers that develop along the surface of the plates will not interfere with each other. The geometry to be considered appears in Figure 1 and is typical of that for a vertically mounted natural convection heat sink.įigure 1. If, instead of a single plate, we wish to consider a closely spaced array of vertically oriented parallel flat plates, a different formula is required. ![]() Drag force: Fd = 1.328 * 0.5 * 1.225 kg/m^3 * (5 m/s)^2 * 4 m^2 = 257.A simple formula to estimate the natural convection heat transfer coefficient on a flat plate was presented in a preceding column. Drag coefficient: Cd = 1.328 (for a flat plate) ![]() ![]() Cross-sectional area of the plate: A = 2 m * 2 m = 4 m^2 Surface area of the plate: A = 2 m * 2 m = 4 m^2 Using the given values, we can calculate: Drag force: Fd = Cd*0.5*rho*u^2*A, where Cd is the drag coefficient and A is the cross-sectional area of the plate. Convective heat transfer rate: Q = h*A*(Ts - T∞), where A is the surface area of the plate. The Prandtl number for air is approximately 0.7. The Reynolds number can be calculated using the equation Re = rho*u*L/mu, where rho is the density of air, mu is the dynamic viscosity of air, and L is the length of the plate. The Nusselt number can be calculated using the equation Nu = 0.664*(Re^0.5)*(Pr^(1/3)), where Re is the Reynolds number and Pr is the Prandtl number. Average convection heat transfer coefficient: h = Nu*k/L, where Nu is the Nusselt number and k is the thermal conductivity of air. (a) For airflow, we can use the following equations: ![]()
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