Questions from Thermal Fluid Science

Q: A furnace that has a 40-cm × 40-cm

A furnace that has a 40-cm × 40-cm glass window can be considered to be a blackbody at 1200 K. If the transmissivity of the glass is 0.7 for radiation at wavelengths less than 3 μm and zero for radiat...

Q: Water (cp = 4180 J/kg⋅K) enters

Water (cp = 4180 J/kg⋅K) enters the 2.5-cm-internal diameter tube of a double-pipe counterflow heat exchanger at 20°C at a rate of 2.2 kg/s. Water is heated by steam condensing at 120°C (hfg = 2203 kJ...

Q: Steam at 400°C has a specific volume of 0.

Steam at 400°C has a specific volume of 0.02 m3/kg. Determine the pressure of the steam based on (a) the ideal-gas equation, (b) the generalized compressibility chart, and (c) the steam tables.

Q: The spectral emissivity function of an opaque surface at 1000 K is

The spectral emissivity function of an opaque surface at 1000 K is approximated as; Determine the average emissivity of the surface and the rate of radiation emission from the surface, in W/m2.

Q: Ethanol is vaporized at 78°C (hfg = 846 kJ

Ethanol is vaporized at 78°C (hfg = 846 kJ/kg) in a double-pipe parallel-flow heat exchanger at a rate of 0.04 kg/s by hot oil (cp = 2200 J/kgâ‹…K) that enters at 115Â...

Q: The emissivity of a tungsten filament can be approximated to be 0

The emissivity of a tungsten filament can be approximated to be 0.5 for radiation at wavelengths less than 1 μm and 0.15 for radiation at greater than 1 μm. Determine the average emissivity of the fil...

Q: Saturated water vapor at 100°C condenses in a one-

Saturated water vapor at 100°C condenses in a one-shell and two-tube heat exchanger with a surface area of 0.5 m2 and an overall heat transfer coefficient of 2000 W/m2⋅K....

Q: Steam is to be condensed on the shell side of a one

Steam is to be condensed on the shell side of a one-shell pass and eight-tube-passes condenser, with 50 tubes in each pass, at 30°C (hfg = 2431 kJ/kg). Cooling water (cp = 4180 J/kgâ&...

Q: How does microwave cooking differ from conventional cooking?

How does microwave cooking differ from conventional cooking?

Q: Reconsider Prob. 22–104. Using appropriate software, investigate

Reconsider Prob. 22–104. Using appropriate software, investigate the effects of the condensing steam temperature and the tube diameter on the rate of heat transfer and the rate of co...