Biot number

In this case, again, the Biot number will be greater than one.

If the Biot number is greater than 0.1, the system will behave as a series solution.

To analyze this problem, the Biot number is important to understand how the system will behave.

Compared required point to trace specified Biot number on the nomogram.

Together with the Biot number, it characterizes transient conduction problems.

Biot numbers much larger than 1 signal more difficult problems due to non-uniformity of temperature fields within the object.

In contrast, the metal sphere may be large, causing the characteristic length to increase to the point that the Biot number is larger than one.

The Biot number must generally be less than 0.1 for usefully accurate approximation and heat transfer analysis.

In general, problems involving small Biot numbers (much smaller than 1) are thermally simple, due to uniform temperature fields inside the body.

By calculating the heat transfer coefficient from this Biot number, we can find a liquid medium suitable for the application.

The Biot number is determined by:

The Biot number increases as the Fourier number decreases.

The Biot number (Bi) is a dimensionless number used in heat transfer calculations.

Together with the Biot number, the Fourier number can be used to solve unsteady state conduction problems.

Since materials differ in their Biot numbers, the time it takes for the material to quench, or the Fourier number, will vary in practice.

The Biot number has a variety of applications, including transient heat transfer and use in extended surface heat transfer calculations.

Having a Biot number smaller than 0.1 labels a substance as thermally thin, and temperature can be assumed to be constant throughout the materials volume.

If the Biot number is less than 0.1, the following equation derived from the Biot and Fourier numbers can be used to find the time.

To determine the number of lumps the Biot number (Bi), a dimensionless parameter of the system, is used.

If the system has a Biot number of less than 0.1, the material behaves according to Newtonian cooling, i.e. with negligible temperature gradient within the body.

The physical significance of Biot number can be understood by imagining the heat flow from a small hot metal sphere suddenly immersed in a pool, to the surrounding fluid.

If the thermal resistance of the fluid/sphere interface exceeds that thermal resistance offered by the interior of the metal sphere, the Biot number will be less than one.

An analogous version of the Biot number (usually called the "mass transfer Biot number", or ) is also used in mass diffusion processes:

If the Biot number is less than 0.1 for a solid object, then the entire material will be nearly the same temperature with the dominant temperature difference will be at the surface.

In this method, the ratio of the conductive heat resistance within the object to the convective heat transfer resistance across the object's boundary, known as the Biot number, is calculated.