- Free convection
- Entry length problem in laminar forced conduction (developing thermal boundary layer)
- Mixed convection (both free and forced)
- Forced convection
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When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by?
Answer: Option 1 Conduction transfers heat via direct molecular collision. An area of greater kinetic energy will transfer thermal energy to an area with lower kinetic energy. Higher-speed particles will...
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When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by?
Answer: Option 3 Thermal radiation generates from the emission of electromagnetic waves. These waves carry the energy away from the emitting object. Radiation occurs through a vacuum or any transparent medium (either...
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Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)?
Answer: Option 1 Sensible Heat Ratio - SHR - is defined as the sensible heat or cooling load divided by the total heat or cooling load. SHR = qs / qt =...
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Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)?
Answer: Option 3 Reynolds number (RN) is given byRN = ρ V l /μwhere h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal...
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Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)?
Answer: Option 1 Fourier's law of heat conduction is k. A. (dT/dx) where Q = Amount of heat flow through the body in unit time, A = Surface area of heat...
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Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)?
Answer: Option 2 Let'
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In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)?
Answer: Option 1 Let'
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Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.?
Answer: Option 3 Let'
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Grashoff number, which is defined as g . β(Ts - T∞) ρ². L³/μ², is proportional to the ratio of buoyancy force to __________ force.?
Answer: Option 1 Let'
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Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of?
Answer: Option 2 Let'
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