Engineering, 06.05.2020 00:28 wendybhenry61391
Problem 1: Experts on hypothermia tell us that heat loss from the body is much greater in 10°C water than in air at the same temperature. To test this, assume that heat transfer from a person can be approximated as that from a vertical cylinder of diameter D = 0.3 m and length L = 1.8 m, with a constant surface temperature of 37°C. Assuming that heat losses from the cylinder occur only at the lateral surfaces, calculate the ratio of the heat transfer rate from the cylinder to water to that for the cylinder to air. Data for the heat transfer properties for water and air can be found in the Appendix in Tables A.2-11 and A.3-3, respectively, and appropriate correlations can be found in eqns (4.7-4), and Tables 4.7-1 and 4.7-2. What do you conclude from this about your odds of survival if you fall into a cold water lake/ocean? (Hint: neglect the cylinder height restriction in Table 4.7-1).
Answers: 2
Engineering, 04.07.2019 18:10
Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.
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Engineering, 04.07.2019 18:10
Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa
Answers: 1
Engineering, 04.07.2019 19:10
Analyze the factors that influence the choice between the following pairs of processes to make the products indicated: i) sand casting versus die casting of an electric-motor housing ii) thread rolling versus machining of a bolt for high-strength application. (co3/c5)
Answers: 3
Engineering, 04.07.2019 19:20
Consider airflow over a flat plate of length l = 1.5 m under conditions for which transition occurs at le = 0.9 m based on the critical reynolds number, re,e = 5 x 10. evaluating the thermophysical properties of air at 400 k, determine the air velocity. (hint: use the tables to find the properties of air)
Answers: 3
Problem 1: Experts on hypothermia tell us that heat loss from the body is much greater in 10°C water...
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