prandtl number वाक्य
उदाहरण वाक्य
मोबाइल
- This bifurcation has also been found in the context of fluid dynamics, namely in double-diffusive convection of a small Prandtl number fluid.
- Liquid metals have small magnetic Prandtl numbers, for example, liquid sodium's P _ M is around 10 ^ {-5 }.
- When the flow is turbulent different correlations involving the Rayleigh Number ( a function of both the Grashof Number and the Prandtl Number ) must be used.
- Helium, mixed with a heavier gas such as xenon, is useful for thermoacoustic refrigeration due to the resulting high heat capacity ratio and low Prandtl number.
- Using the mass-heat transfer analogy, the Nusselt number is replaced by the Sherwood number, and the Prandtl number is replaced by the Schmidt number.
- If the Prandtl number is less than 1, which is the case for air at standard conditions, the thermal boundary layer is thicker than the velocity boundary layer.
- When used in connection with mass transfer the Prandtl number is replaced by the Schmidt number, Sc, which expresses the ratio of the momentum diffusivity to the mass diffusivity.
- While Dittus-Boelter requires the Prandtl number to be between 0.7 and 160, Seider-Tate applies to values between 0.7 and 16, 700.
- Experimental data for gas streams agree approximately with above equation if the Prandtl numbers are near 1.0 and only skin friction is present in flow past a flat plate or inside a pipe.
- Because the Prandtl number of a particular fluid is not often unity, German engineer E . Polhausen who worked with Ludwig Prandtl attempted to empirically extend these equations to apply for Pr \ ne 1.
- Depends on different flow conditions ( laminar, turbulent, shapes of entrance, etc . ), the Nusselt number has different dependence on Reynolds number, Prandtl number and the friction factor of the flow.
- Ashok Malhotra and Kang ( 1984 ) showed through calculations in a circular pipe that the Turbulent Prandtl Number is not close to unity but rather a strong function of the moleculer Prandtl number amongst other parameters.
- Ashok Malhotra and Kang ( 1984 ) showed through calculations in a circular pipe that the Turbulent Prandtl Number is not close to unity but rather a strong function of the moleculer Prandtl number amongst other parameters.
- The Churchill Bernstein equation is valid for a wide range of Reynolds numbers and Prandtl numbers, as long as the product of the two is greater than or equal to 0.2, as defined above.
- Computed results in form of tables, graphs and figures for a fluid with Prandtl number = 0.71 with Rayleigh number ( Ra ) ranging from 10 3 to 10 7 are available in the literature.
- Note that whereas the Reynolds number and Grashof number are subscripted with a length scale variable, the Prandtl number contains no such length scale in its definition and is dependent only on the fluid and the fluid state.
- At the base of the Sun's convection zone the Magnetic Prandtl number is approximately 10 " 2, and in the interiors of planets and in liquid-metal laboratory dynamos is approximately 10 " 5.
- It is a strong function of the molecular Prandtl number amongst other parameters and the Reynolds Analogy is not applicable when the molecular Prandtl number differs significantly from unity as determined by Malhotra and Kang; and elaborated by McEligot and Taylor and Churchill
- It is a strong function of the molecular Prandtl number amongst other parameters and the Reynolds Analogy is not applicable when the molecular Prandtl number differs significantly from unity as determined by Malhotra and Kang; and elaborated by McEligot and Taylor and Churchill
- Nevertheless this complicates the problem of launching jets : strong concentrations of magnetic field are required at the inner regions of the disc in order to launch jets, but a magnetic Prandtl number of order unity causes the field to diffuse away faster than it accretes inward.
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