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1. Air at 25°C and 1 atm is in fully developed flow at m· = 10-3 kg/s through a 10-mm-diameter circular tube whose inner surface is wetted with water. Determine the tube length required for the water vapor in the air to reach 99% of saturation. The inlet air is dry.
2. A humidifier consists of a bundle of vertical tubes, each of 20-mm diameter, through which dry atmospheric air is in fully developed flow at 10-3 kg/s and 298 K. The inner tube surface is wetted with a water film. Determine the tube length required for the water vapor to reach 99% of saturation. What is the rate at which energy must be supplied to each tube to maintain its temperature at 298 K?
The state of 1 lbm of steam is changed from saturated vapor at 20 psia to superheated vapor at 50 psia and 1000 F. What are the enthalpy and entropy changes of the steam? What would the enthalpy and entropy changes be if steam were an ideal gas?
For plain carbon steel, with properties at 300K in the Appendix and convection (h=50 W/m^2 K) to air at 500K. the diameter of largest solid sphere for lumped behaviour (2 part- show equivalent length is D/6 and that D for Bi
1. the contraption below has a face cam with an elliptic pro?le pushing a push rod against a spring. the face cam is
Estimate the centrifugal tension F c and the torque T and estimate the allowable F 1 , F 2 , F i and allowable power
determine the center deflection of a clamped circular plate subjected to a point load q 0 at a distance b from the
below is pressure measured at different timetime
Consider the flow of a uniform stream of speed V in the x-direction and a sink of strength Q at the origin. Find the stagnation point(s) and the equation of the stagnation streamline. Sketch (freehand) the flow streamlines
r-134a flows through a refrigeration system at a rate of .12 kgs. at the entrance to the adiabatic compressor the
Carbon dioxide initially at 50 kPa, 400 K, undergoes a process in a closed system until its pressure and temperatures are 2 MPa and 800 K, respectively. Assuming ideal gas behavior, find the entropy change of the carbon dioxide (Cp = 1.054 kJ/kg.K)
Write a program that allows the user to enter a number that represent the month of a year (1 to 12) and uses a switch construct to convert the month number to its corresponding number of days, where January is considered the 1st month of a year and D..
another guide recommends 12700 lbhr water flowrate through 2 pipe and says that this will give 16 water friction
A piston cylinder device contains 3kg of water vapor at 30 bar and 350ºC. it is cooled at constant volume until the temperature reaches 195ºC. Then it is compressed at constant temperature to 20bar. (a) Show the process on a T-V diagram. (b) Determin..
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