Acounter-flow heat exchange consists of two concentric copper tubes with wall thick- nesses t = 0.5 mm and lengths 1.5 m, and diameters 15 mm and 21 mm.. the hot water flow through the inner tube and the counterflowing cold water flow in the annulus between the inner and outer tubes are both equal to 2 litres per hour, and their input temperatures are 80 °c and 20 °c, respectively. calculate their output temperatures when thermal equilibrium has been established. assume the outer cylinder is well insu- lated. the nusselt number when there is a constant heat transfer rate and the water flow is laminar is equal to 4.36. the thermal conductivities of water and copper are 0.58 and 400 w m'k, respectively. the specific heat of water is 4180 j kg k.
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Chemistry, 22.06.2019 07:20, rscvsdfsrysas1857
The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.
Answers: 1
Chemistry, 22.06.2019 12:30, nekathadon
The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms
Answers: 1
Acounter-flow heat exchange consists of two concentric copper tubes with wall thick- nesses t = 0.5...
Mathematics, 03.03.2021 07:40
Mathematics, 03.03.2021 07:40
Mathematics, 03.03.2021 07:40
Mathematics, 03.03.2021 07:40