What is the steam economy in case of a single effect evaporator system ?
If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length
jH factor for heat transfer is not a function of the __________ number.
The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by
The energy radiated from a surface Q at absolute temperature T is related as
Baffles are provided in heat exchangers to increase the
In case of a vertical tube evaporator, with increase in the liquor level, the
The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.
200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 x 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moistu
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always
Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
With increase in temperature, the thermal conductivity of steel
A 2-4 heat exchanger involves
The main function of baffles provided in a shell and tube heat exchanger is to
In a single effect evaporator, the economy is
Latent heat absorbed by 1 lb of water at 212oF, when it is changed to steam at 212oF, may be around __________ BTU.
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is
Which of the following is not concerned with the heat transfer?
In counter flow compared to parallel flow,
The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is
(Stefan-Boltzman constant = 5.67xl0-8 W/m2.K4)
Crystallisation of solids from a homogeneous solution is a/an __________ process.
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is
Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by
Value of Prandtl number for water ranges from