Questions from Thermal Fluid Science

Q: A 3-mm-thick glass window transmits 90 percent of

A 3-mm-thick glass window transmits 90 percent of the radiation between λ = 0.3 and 3.0 μm and is essentially opaque for radiation at other wavelengths. Determine the rate of radiation transmitted thr...

Q: Ethane at 10 MPa and 100°C is heated at constant

Ethane at 10 MPa and 100°C is heated at constant pressure until its volume has increased by 60 percent. Determine the final temperature using (a) the ideal-gas equation of state and (b) the compressib...

Q: Consider the sun, which is considered to be a blackbody with

Consider the sun, which is considered to be a blackbody with a surface temperature of roughly 5800 K. Determine the percentage of solar energy (a) in the visible range, (b) at wavelengths shorter than...

Q: What is a gray body? How does it differ from a

What is a gray body? How does it differ from a blackbody? What is a diffuse gray surface?

Q: Define the properties emissivity and absorptivity. When are these two properties

Define the properties emissivity and absorptivity. When are these two properties equal to each other?

Q: Classify heat exchangers according to flow type, and explain the characteristics

Classify heat exchangers according to flow type, and explain the characteristics of each type.

Q: Define the properties reflectivity and transmissivity, and discus the different forms

Define the properties reflectivity and transmissivity, and discus the different forms of reflection.

Q: In a thin-walled double-pipe heat exchanger, when

In a thin-walled double-pipe heat exchanger, when is the approximation U = hi a reasonable one? Here U is the overall heat transfer coefficient and hi is the convection heat transfer coefficient insid...

Q: What is the greenhouse effect? Why is it a matter of

What is the greenhouse effect? Why is it a matter of great concern among atmospheric scientists?

Q: Consider the operation of a single-pass crossflow heat exchanger with

Consider the operation of a single-pass crossflow heat exchanger with water (cp = 4193 J/kg⋅K) (mixed) and methanol (cp = 2577 J/kg⋅K) (unmixed). Water entering and exiting the heat exchanger at 90°C...