Chemical Heat Transfer

The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?

Byadmin March 2, 2019August 24, 2021

The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?

A. Von-Karman
B. Reynolds
C. Colburn
D. Prandtl

Chemical Heat Transfer

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?

A. 5.6
B. 0.025
C. 3.5
D. 0.0035

Read More A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?
Chemical Heat Transfer

The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?

The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?

A. 1000
B. 727
C. 800
D. 1200

Read More The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?
Chemical Heat Transfer

Grashoff number, which is defined as g . β (Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to ____________ force?

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

Read More Grashoff number, which is defined as g . β (Ts – T∞) ρ2. L3/μ2, is proportional to the ratio of buoyancy force to ____________ force?
Chemical Heat Transfer

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?

A. 50 -100 Kcal/hr.m2.°C
B. 50 -100 W/m2.°K
C. 50 -100 BTU/hr. ft.2°F
D. 1000 – 1500 BTU/hr. ft.2°F

Read More Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?
Chemical Heat Transfer

Peclet number (Pe) is given by____________________?

Peclet number (Pe) is given by____________________?

A. Pe = Re.Pr
B. Pe = Re/Pr
C. Pe = Pr/Re
D. Pe = Nu.Re

Read More Peclet number (Pe) is given by____________________?
Chemical Heat Transfer

For heat flow through very thick walled cylinder, use ___________mean radius?

For heat flow through very thick walled cylinder, use ___________mean radius?

A. Arithmetic
B. Logarithmic
C. Geometric
D. Either A. or C.

Read More For heat flow through very thick walled cylinder, use ___________mean radius?

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