Questions from Thermal Fluid Science

Q: Air is flowing in parallel over the upper surface of a flat

Air is flowing in parallel over the upper surface of a flat plate with a length of 4 m. The first half of the plate length, from the leading edge, has a constant surface temperature of 50°C...

Q: Reconsider Prob. 20–20. Using appropriate software, evaluate

Reconsider Prob. 20–20. Using appropriate software, evaluate the effect of the uniform surface heat flux on the plate midpoint temperature for (a) the highly polished surface and (b)...

Q: Reconsider Prob. 19–33. Using appropriate software, evaluate

Reconsider Prob. 19–33. Using appropriate software, evaluate the local convection heat transfer coefficient, the local surface temperature, and the local film temperature along the p...

Q: Consider a 1.2-m-high and 2-

Consider a 1.2-m-high and 2-m-wide glass window with a thickness of 6 mm, thermal conductivity k = 0.78 W/m⋅K, and emissivity ε = 0.9. The room and the walls that face t...

Q: A 15-cm × 15-cm circuit board dissipating 20

A 15-cm × 15-cm circuit board dissipating 20 W of power uniformly is cooled by air, which approaches the circuit board at 20°C with a velocity of 6 m/s. Disregarding any heat transfer from the back su...

Q: Consider a 2-ft × 2-ft thin square plate

Consider a 2-ft × 2-ft thin square plate in a room at 75°F. One side of the plate is maintained at a temperature of 130°F, while the other side is insulated. Determine the rate of heat transfer from t...

Q: Consider laminar flow of air across a hot circular cylinder. At

Consider laminar flow of air across a hot circular cylinder. At what point on the cylinder will the heat transfer be highest? What would your answer be if the flow were turbulent?

Q: Reconsider Prob. 20–23E. Using appropriate software, plot

Reconsider Prob. 20–23E. Using appropriate software, plot the rate of natural convection heat transfer for different orientations of the plate as a function of the plate temperature as the temperature...

Q: A grist mill of the 1800s employed a waterwheel that was 14

A grist mill of the 1800s employed a waterwheel that was 14 m high; 480 L/min of water flowed onto the wheel near the top. How much power, in kW, could this waterwheel have produced?

Q: A long 12-cm-diameter steam pipe whose external surface

A long 12-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open area that is not protected against the winds. Determine the rate of heat loss from the pipe per uni...