Engineering, 05.07.2020 14:01 andrew2786
For the cases below, a closed system undergoes a process in which work is done on the system and the heat transfer Q occurs only at a location on the boundary where the temperature is Tb. For each case, determine whether the entropy change of the system is positive, negative, zero, or indeterminat. a. internally reversible process, Q > 0.b. internally reversible process, Q = 0.c. internally reversible process, Q < 0.d. internal irreversibilities present, Q > 0.e. internal irreversibilities present, Q = 0.f. internal irreversibilities present, Q < 0.
Answers: 3
Engineering, 04.07.2019 18:20
Air flows over a heated plate Ă t a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.
Answers: 1
Engineering, 06.07.2019 03:10
Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air
Answers: 1
Engineering, 06.07.2019 04:20
In modern manufacturing, which types of metal chips would be undesirable and why ? ?
Answers: 3
Engineering, 06.07.2019 04:30
State two advantages and two disadvantages of interchangeability.
Answers: 3
For the cases below, a closed system undergoes a process in which work is done on the system and the...
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