fourier number การใช้

• To derive the heat transfer Fourier number,, the heat equation in one dimension is,
• For unsteady state conduction problems in solids, the Fourier number is frequently used as a nondimensional time parameter.
• Both forms of the Fourier number defined above are found by making the variables dimensionless of time dependent diffusion equations.
• Plotted along the horizontal axis is the Fourier Number, " Fo = ?t / L 2 ".
• Together with the Biot number, the Fourier number can be used to determine the heating or cooling of an object.
• Since materials differ in their Biot numbers, the time it takes for the material to quench, or the Fourier number, varies in practice.
• The following equation, derived with the product of the Biot and Fourier numbers, can be used to estimate the time for the object to reach a specific temperature,
• This procedure may be performed analogously on Fick's second law of diffusion to derive the mass transfer Fourier number,, and applied to time depending mass transport problems.
• In steel, the quenching temperature range is generally from 600 癈 to 200 癈 . To control the quenching time and to select suitable quenching media, it is necessary to determine the Fourier number from the desired quenching time, the relative temperature drop, and the relevant Biot number.