ME 514 - Fluid Dynamics
Handout 3
Question 1: In the scenario of water flowing steadily through a heated horizontal pipe, which term in the
energy equation primarily accounts for the increase in the internal energy of the water?
0)
1. ∂(ρe
∂t
∂
2. ∂x
(ρe0 uj )
j
∂qi
3. − ∂x
i
4. ρgi ui
Question 2: In the example of water flowing through a heated pipe, what is the primary effect of the
∂
(τij ui )?
viscous dissipation term ∂x
j
1. It represents the loss of mechanical energy due to gravity.
2. It accounts for the energy added to the fluid from the heat source.
3. It represents the advection of energy along the flow.
4. It causes the conversion of mechanical energy into thermal energy in water.
∂
(ρe0 uj ) represent?
Question 3: In water flow in a heated pipe example, what does the term ∂x
j
1. The rate of work done by gravity.
2. The energy flux due to advection along the flow direction.
3. The conversion of kinetic energy into thermal energy due to viscosity.
4. The heat flux into the fluid due to external heating.
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