This page calculates the convective and radiative heat transfer from an isothermal vertical plate. The average convective heat transfer coefficient is calculated assuming natural convection conditions. The convection calculation automatically switches between laminar and turbulent convection correlations based on Rayleigh number. The plate transfers heat from only one of its sides. It is assumed to be insulated on the other. Define the plate size, surface temperature and ambient temperature. You also need to define the fluid properties. This page will calculate a heat transfer coefficient based on the flow conditions as well as the heat transfer by convection and radiation from the isothermal plate. To account for convection only, make the emissivity equal to 0. Similarly, to account for radiation only, make the tehrmal conductivity = 0.   Do you want to know more ?

Plate and Flow Conditions

Fluid Properties at Film Temperature, Except for Density. (Defaults are for Air at 20C)

 Description Symbol Value Units Film Temperature = (Tp+Ta)/2 Tf oC Specific Heat Cp J/kg-oC Coefficient of Thermal Expansion B 1/K Thermal Conductivity k W/m-oC Dynamic Viscosity µ kg/m-s Density at reference temperature of 20 C rhoref kg/m3 Density calculated at film temperature Tf rho kg/m3 Emissivity e None

Plate Dimensions

 Description Symbol Value Units Plate Width (across flow) W Meters Plate Height (with flow) H Meters Plate Temperature Tp oC Ambient Temperature Ta oC

Results for Plate

 Description Symbol Value Units Prandlt Number = v/a Pr None Grashof Number = g*cte*(Tp-Ta)*H3/v2 Gr None Rayleigh Number = Gr*Pr Ra None Nusselt= Nu None Average Heat Transfer Coefficient = Nu*k/H h W/m2-C Convective HeatTransfer = h*W*H*(Tp-Ta) qconv W Radiative Heat Transfer= Sigma*W*H*e*(Tp4-Ta4) qrad W Total Heat Transfer = qconv + qrad qtot W