# Biot number

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## Biot number

[′byō ‚nəm·bər]
(fluid mechanics)
A dimensionless group, used in the study of mass transfer between a fluid and a solid, which gives the ratio of the mass-transfer rate at the interface to the mass-transfer rate in the interior of a solid wall of specified thickness.
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When (Bi = 10),the temperature of fluid at the free surface decreases as the Biot number increases due to presence a convection cooling.
An increase in Biot number from 30 to 100 produces no more effective on the flow pattern because of the buoyancy force dominating the whole domain whereas surface tension becomes insignificant at the same magnitudes of Marangoni number.
The multilayered PCM allows the Biot number to be varied by changing the layer thickness.
The variation of Biot number with time is shown in Figure 9 for the 8 mm (0.
film thickness was varied in order to consider the influence of the Biot number of the film on the bending moment.
The Biot number is a critical parameter in understanding the warpage of the FIM part because it includes the effect of thickness and thermal properties of the part.
Then, the Biot number, Bi, can be obtained from Equation (8) and the surface heat transfer coefficient, h, may be obtained through algebraic manipulation of the definition of the Biot number, Equation (6).
1993, 1996a, 1996b) present equations for determining the equivalent heat transfer dimensionality, E, as a function of Biot number and shape of the food item (short cylinder, squat cylinder, rectangular rod, ellipsoid, etc.
The Biot number is often useful for the analysis of conductive-convective heat transfer between a solid surface and a fluid and is the ratio of the thermal resistance of the two media exchanging heat across a surface.
2]*[degrees]F), and the Biot number has been determined as 6.
This conclusion is also supported by the fact that the Biot number for this case is much less than 1 (Bi = 0.
A small Biot number represents an adiabatic wall, while a large Biot number corresponds to an isothermal boundary approximately.

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