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Thermodynamics Forum
Dimensionless Numbers in Heat Transfer - GATE ME '10
Match the following List-I P. Compressible flow Q. Free surface flow R. Boundary layer flow S. Pipe flow T. Heat convection List-II U. Reynolds number V. Nusselt number W. Weber number X. Froude number Y. Mach number Z. Skin friction coefficient Answers: A. P−U, Q−X, R−V, S−Z, T−W B. P−W, Q−X,
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Sep 17
Thermodynamics Forum
Temperature profile near the surface of a convectively cooled flat plate - GATE ME '14 S1
The non-dimensional fluid temperature profile near the surface of a convectively cooled flat plate is given by (Tw−T)/(Tw−T∞) = a+b(y/L)+c(y/L)^2, where y is measured perpendicular to the plate, L is the length, and a,b and c are arbitrary constants. Tw and T∞ are wall and ambiyent temperatures, res
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Sep 16
Thermodynamics Forum
Grashoff Number - GATE ME '16 S3
Grashoff number signifies the ratio of A. inertia force to viscous force B. buoyancy force to viscous force C. buoyancy force to inertia force D. inertial force to surface tension force
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Sep 16
Thermodynamics Forum
Range of Heat Transfer Coefficients for different Convection Processes - GATE ME '98
Heat transfer coefficients for free convection in gases, forced convection in gases and vapors, and for boiling water lie, respectively, in the range of ______ A. 5−15, 20−200, and 3000−50000 W/m^2.K B. 20−50, 200−500, and 50000−100000 W/m^2.K C. 50−100, 500−1000, and 100000−1000000 W/m^2.K D. 20−1
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Sep 16
Thermodynamics Forum
Relationship between Free Stream Velocity and Heat Transfer Coefficient in Forced Convection Over a Flat Plate - GATE ME '14 S2
For laminar forced convection over a flat plate, if the free stream velocity increases by a factor of 2, the average heat transfer coefficient A. remains same B. decreased by a factor of 2 C. rises by a factor of 2 D. rises by a factor of 4
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Sep 16
Thermodynamics Forum
At what location does the slope of the velocity profile is maximum in natural convection over a vertical plate?
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Jul 12
Thermodynamics Forum
What is the formula for the Grashof number?
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Jul 12
Thermodynamics Forum
What is the significance of Rayleigh number?
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Jul 12
Thermodynamics Forum
What is Gnielinski equation?
What are the assumptions of Gnielinski equation?
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Jul 11
Thermodynamics Forum
Why there are multiple empirical formulations mainly in convection heat transfer and fluid flow problems?
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Jul 11
Thermodynamics Forum
Convection Heat Transfer - GATE ME '13
Water (specific heat, cp = 4.18 kJ/kg.K ) enters a pipe at a rate of 0.01 kg/s and a temperature of 20 C. The pipe, of diameter 50 mm and length 3 m, is subjected to a wall heat flux qw in W/m^2: If qw = 2500x, where x is m and in the direction of flow (x=0 at the inlet), the bulk mean temperature o
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Sep 17
Thermodynamics Forum
Turbulence and Mixing - GATE ME '14 S3
Consider the turbulent flow of a fluid through a circular pipe of diameter, D. Identify the correct pair of statements. I. The fluid is well-mixed II. The fluid is unmixed III. ReD<2300 IV. ReD>2300 A. I, III B. II, IV C. II, III D. I, IV
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Sep 16
Thermodynamics Forum
Nusselt Number, Reynolds Number, Prandtl Number - GATE ME '11
The ratios of the laminar hydrodynamic boundary layer thickness to thermal boundary layer thickness of flows of two fluids P and Q on a flat plate are 12 and 2 respectively. The Reynolds number based on the plate length for both the flows is 10^4. The Prandtl and Nusselt numbers for P are 18 and 35
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Sep 16
Thermodynamics Forum
Thermal boundary layer thickness - GATE ME '08
For a flow of fluid over a heated plate, the following fluid properties are known: Viscosity = 0.001 Pa.s; Specific heat at constant pressure = 1 kJ/kg.K; Thermal conductivity = 1 W/m.K, The hydrodynamic boundary layer thickness at a specified location on the plate is 1 mm, and the thermal boundary
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Sep 16
Thermodynamics Forum
Thermal Boundary Layer - GATE ME '15 S1
For the flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate temperature, the thermal boundary layer is A. thinner than the velocity boundary layer B. thicker than the velocity boundary layer C. of the same thickness as the velocity boundary layer D. not formed
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Sep 16
Thermodynamics Forum
Can natural convection be possible in space?
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Jul 12
Thermodynamics Forum
What is the significance of grashof number?
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Jul 12
Thermodynamics Forum
The Dittus-Boelter equation is valid for which Reynolds number?
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