Physics · Fluid Mechanics and Heat Transfer
Consider a hydrodynamically and thermally fully developed laminar flow through a circular pipe along the z-direction. T is the fluid temperature, Tw is the wall temperature, and Tm is the bulk mean temperature of the fluid. For a constant wall temperature (Tw > Tm), which of the following statements is TRUE?
- 1The derivative dTm/dz decreases exponentially with distance along the z-direction.✓
- 2The spatial derivative dTm/dz remains constant.
- 3The temperature gradient ∂T/∂z is always zero.
- 4The Nusselt number varies linearly along the z-direction.
Correct answer
The derivative dTm/dz decreases exponentially with distance along the z-direction.
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