Heat transfer by natural convection is enhanced in system with

Home / Chemical Engineering / Heat Transfer / Question

Examveda

Heat transfer by natural convection is enhanced in system with

A. High viscosity

B. High co-efficient of thermal expansion

C. Low temperature gradients

D. Low density change with temperature

Answer: Option B

This Question Belongs to Chemical Engineering >> Heat Transfer

Join The Discussion

Comments (1)

FAIZAL B:

5 years ago

Which equation is used to determine the heat flux for convention

Related Questions on Heat Transfer

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, N_c = 0.5 × 10^-3 kg/m².s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m²/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)

A. 0.5

B. 0.05

C. 0.1

D. 0.15

View Answer

View Answer

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/(kgK). The rate at which the heat has to be supplied in (kJ/min) to the evaporator is

A. 3.06 × 10⁵

B. 6.12 × 10⁵

C. 7.24 × 10⁵

D. 9.08 × 10⁵

View Answer

View Answer

Fqra cold viscous feed, backward feed gives __________ than forward feed.

A. A higher capacity

B. A lower capacity

C. Lower economy

D. None of these

View Answer

View Answer

In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.

A. Twice

B. Four times

C. Square root of

D. Square of

View Answer

View Answer

More Related Questions on Heat Transfer