Biot Number
Biot Number, abbreviated as Bi, a dimensionless number, is the ratio of internal thermal resistance of solid to fluid thermal resistance. This is used for heat transfer between fluids and solids.
Biot Number formula |
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\(\large{ Bi=\frac{h \; l_c}{k} }\) | ||
Symbol | English | Metric |
\(\large{ Bi }\) = biot number | \(\large{dimensionless}\) | |
\(\large{ l_c }\) = characteristic length | \(\large{ft}\) | \(\large{m}\) |
\(\large{ h }\) = heat transfer coefficient of film coefficient or convective heat transfer coefficient | \(\large{\frac{Btu}{hr-ft^2-F}}\) | \(\large{\frac{W}{m^2-K}}\) |
\(\large{ k }\) = thermal conductivity of the body | \(\large{\frac{Btu-ft}{hr-ft^2-F}}\) | \(\large{\frac{W}{m-K}}\) |
Tags: Heat Transfer Equations