Test: Nucleate Boiling - Chemical Engineering MCQ
10 Questions MCQ Test - Test: Nucleate Boiling
Reynolds number is replaced by a modulus significant of the agitation of the fluid particles in nucleate boiling. Such a dimensionless modulus is defined by the relation
Where, D b is the average bubble diameter, G b is the mass velocity of the bubble per unit area and δ f is the fluid viscosity
The bubble diameter has been expressed by Fritz as
Where, C d is a constant, σ is surface tension of the liquid and β is the bubble contact angle measured through liquid in degrees
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Spherical bubbles of 3 mm diameter are observed in the bulk fluid boiling of water at standard atmospheric pressure. Assuming pure water vapor in the bubble and vapor pressure equal to 101.325 k N/m2, calculate the temperature of the vapor
An electric wire of 1.25 mm diameter and 250 mm long is laid horizontally and submerged in water at 7 bar. The wire has an applied voltage of 2.2 V and carries a current of 130 amperes. If the surface of the wire is maintained at 200 degree Celsius, make calculations for the heat flux
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Which of the following parameters affect burnout heat flux in the nucleate boiling region
(i) Heat of evaporation
(ii) Temperature difference
(iii) Density of vapor
(iv) Density of liquid
(v) Surface tension at the vapor-liquid interface
Mark the correct answer from the codes indicated below
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