Question

Answer all the following: 1. Natural convection is the result of fluid motion due to what? a. Body forces b. Density gradients c. Density gradients and body forces d. Temperature difference alone 2. The Grashof number represents what? a. The ratio of buoyancy forces to inertial forces b. The ratio of inertial forces to viscous forces c. The ratio of buoyancy forces to viscous forces d. The ratio of viscous forces to buoyancy forces 3. Under what condition are the contributions of natural and forced convection of equal importance? a. $Gr/Re < 1$ b. $Gr/Re = 1$ c. $Gr/Re^2 > 1$ d. $Gr/Re^2 = 1$ 4. Natural convection over a vertical surface generates a flow that always moves upwards a. True b. false

          Answer all the following:
1. Natural convection is the result of fluid motion due to what?
a. Body forces
b. Density gradients
c. Density gradients and body forces
d. Temperature difference alone
2. The Grashof number represents what?
a. The ratio of buoyancy forces to inertial forces
b. The ratio of inertial forces to viscous forces
c. The ratio of buoyancy forces to viscous forces
d. The ratio of viscous forces to buoyancy forces
3. Under what condition are the contributions of natural and forced convection of equal
importance?
a. $Gr/Re < 1$
b. $Gr/Re = 1$
c. $Gr/Re^2 > 1$
d. $Gr/Re^2 = 1$
4. Natural convection over a vertical surface generates a flow that always moves upwards
a. True
b. false

Answer all the following:
1. Natural convection is the result of fluid motion due to what?
a. Body forces
b. Density gradients
c. Density gradients and body forces
d. Temperature difference alone
2. The Grashof number represents what?
a. The ratio of buoyancy forces to inertial forces
b. The ratio of inertial forces to viscous forces
c. The ratio of buoyancy forces to viscous forces
d. The ratio of viscous forces to buoyancy forces
3. Under what condition are the contributions of natural and forced convection of equal
importance?
a. Gr/Re < 1
b. Gr/Re = 1
c. Gr/Re^2 > 1
d. Gr/Re^2 = 1
4. Natural convection over a vertical surface generates a flow that always moves upwards
a. True
b. false

Added by Jessica T.

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