How does the thermal conductivity of a material change with respect to change in temperature of the same material?
Heat transfer deals with the rate of
The cooling of a metal ball of volume V, in large quantity of fluid is analogous to
What should be the Biot number to assume the body at uniform temperature?
If the body or element is in steady-state but has heat generation then the general heat conduction equation which gives the temperature distribution and conduction heat flow in an isotropic solid reduces to(∂T/∂x2) + (∂T/∂y2) + (∂T/∂z2) + (q̇/k) = 0. This equation is known as
What is the correct formula for the temperature distribution in infinitely long fin?
For effective working of fins, the thickness of the fines should be
Which of the following arrangements of fins is more effective for the same base area?
1. Large number of closely spaced fins
2. Small number of thick fins
Aluminum is used as a fin material because
An engine is fitted with pin fins having thermal conductivity k = 200 W/mK. The diameter and length of the fin is 2 cm and 50 cm respectively. Calculate the temperature at 10 cm from the fin base if fine base temperature is 500 0C and fin is in contact with air at 50 0 Take h = 12 W/m2K
Consider that the fin is infinitely long
In convection heat transfer energy transfer takes place between
The convection heat transfer coefficient depends upon
Conduction plus fluid flow in motion is known as
Forced convection in a liquid bath is caused by
What is the value of convective coefficient of oil in case of forced convection?
Heat exchangers are classified into how many categories?
The energy transfer between the hot fluid and cold fluids is brought about by their complete physical mixing in
Which of the following is not an example of recuperators type heat exchanger?
In how many categories heat exchangers are classified on the basis of direction of flow of fluids?
Identify the correct expression for effectiveness
The radiation takes place
Which phenomenon is related to the term radiation?
What is the approximate wavelength range of thermal radiation?
The wavelength range of the visible light is about
Which of the following bodies will not be able to emit radiation continuously?
