Questions from Thermal Fluid Science

Q: What is the crossed-strings method? For what kinds of

What is the crossed-strings method? For what kinds of geometries is the crossed-strings method applicable?

Q: A single-pass crossflow heat exchanger uses hot air (mixed

A single-pass crossflow heat exchanger uses hot air (mixed) to heat water (unmixed), flowing with a mass flow rate of 3 kg/s, from 30°C to 80°C. The hot air enters and exits the...

Q: Consider two coaxial parallel circular disks of equal diameter D = 1

Consider two coaxial parallel circular disks of equal diameter D = 1 m spaced apart by 1 m, and two aligned parallel square plates (1 m × 1 m) also spaced apart by 1 m. Determine the view...

Q: Oil in an engine is being cooled by air in a crossflow

Oil in an engine is being cooled by air in a crossflow heat exchanger, where both fluids are unmixed. Oil (cph = 2047 J/kgâ‹…K) flowing with a flow rate of 0.026 kg/s enters the tube s...

Q: Consider two coaxial parallel circular disks of equal diameter D that are

Consider two coaxial parallel circular disks of equal diameter D that are spaced apart by a distance L. If the view factor is F12 = 0.1, without altering the diameter of the disks, determine a solutio...

Q: Under what conditions can the overall heat transfer coefficient of a heat

Under what conditions can the overall heat transfer coefficient of a heat exchanger be determined from U =(1/hi + 1/ho)−1?

Q: Cylindrical heaters are spaced equally at 5 cm apart in a row

Cylindrical heaters are spaced equally at 5 cm apart in a row, and the heaters are positioned between two large parallel plates. If the diameter of the cylinders is 35 mm, determine the view factors b...

Q: Is it true that it takes more energy to vaporize 1 kg

Is it true that it takes more energy to vaporize 1 kg of saturated liquid water at 100°C than it would at 120°C?

Q: Consider a water-to-water counterflow heat exchanger with these

Consider a water-to-water counterflow heat exchanger with these specifications. Hot water enters at 90°C while cold water enters at 20°C. The exit temperature of the hot water is...

Q: Consider an enclosure consisting of 13 surfaces. How many view factors

Consider an enclosure consisting of 13 surfaces. How many view factors does this geometry involve? How many of these view factors can be determined by the application of the reciprocity and the summat...