Exam 12: Thermal Properties and Processes

The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.

For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is

In thermal radiation for a black body (where, ? is emissivity and ? is absorptivity)

Pick out the wrong statement.

In forced circulation, the heating element is injected

Dropwise condensation occurs on __________ surfaces.

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.

Viscous & heat sensitive liquids are concentrated in __________ evaporators.

During crystallisation, formation of crystal can occur in __________ solution only.

In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

Nusselt number (for forced convection heat transfer) is a function of the __________ number.

For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would

The separation of liquid droplets from the vapor is done by a/an __________, in the evaporators.

In a boiling curve, the peak heat flux is called the __________ point.

When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

Film condensation is promoted on a/an __________ surface.

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

In a 1-1 concurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is