In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Question: Grashoff number, which is defined as g . β(Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to __________ force.
[A].

viscous

[B].

elastic

[C].

inertial

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Economy of a multiple effect evaporator depends upon the
[A].

heat balance consideration

[B].

rate of heat transfer

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option A

Explanation:

No answer description available for this question.

Question: Maximum heat transfer rate is obtained in __________ flow.
[A].

laminar

[B].

turbulent

[C].

creeping

[D].

transition region

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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

Explanation:

No answer description available for this question.