4.A compression spring has a diameter of 0.67 in and a coil diameter of 0.067 in, with 30 total coils. The spring is to be made
of unpeened HD A227 wire and have squared and ground ends. Find the fatigue factor of safety when repeatedly cycled from 0 to 10.3 lbf. Use the Gerber fatigue criterion and the Zimmerli data.
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Answer:
Explanation:
The mixing chamber can be modelled by applying the First Law of Thermodynamics:
Since that mass flow rate of water at inlet 1 is the only known variable, the expression has to be simplified like this:
Besides, the following expression derived from the Principle of Mass Conservation is presented below:
Then, the expression is simplified afterwards:
Specific enthalpies are obtained from steam tables and described as follows:
State 1 (Superheated vapor)
State 2 (Saturated liquid)
State 3 (Liquid-Vapor mixture)
The ratio of the stream at state 2 to the stream at state 1 is:
The mass flow rate of the saturated liquid is: