A) Among the nondimensional numbers, in free convection, average Nusselt number depends on only Grashof and Prandtl numbers. only Grashof number. Rayleigh number. Reynolds number. B) For ideal gases, the specific heat capacity at constant pressure, thermal conductivity, dynamic viscosity, and Prandtl number are independent of pressure. How will the ratio of thicknesses of velocity boundary layer and thermal boundary layer change if pressure is increased from 1 atm to 5 atm for the flow of an ideal gas over a flat plate? We need to know the actual fluid properties to tell It will remain the same. It will decrease by a factor of 5. It will increase by a factor of 5.
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Only attempt if previously not attempted. Answer part a and b
A)
Among the nondimensional numbers, in free convection, average Nusselt number depends on
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only Grashof and Prandtl numbers. |
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only Grashof number. |
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Rayleigh number. |
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Reynolds number. |
B)
For ideal gases, the specific heat capacity at constant pressure, thermal conductivity, dynamic viscosity, and Prandtl number are independent of pressure. How will the ratio of thicknesses of velocity boundary layer and thermal boundary layer change if pressure is increased from 1 atm to 5 atm for the flow of an ideal gas over a flat plate?
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We need to know the actual fluid properties to tell |
|
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It will remain the same. |
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| It will decrease by a factor of 5. | |
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It will increase by a factor of 5. |
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