Optimization of vortex tube parameters to achieve the minimum possible temperature
A vortex tube is a mechanical device for separating a stream of compressed air into two streams of colder and warmer air than the inlet stream at the same time. Simple design, small volume and no need for repair, caused this dual-purpose device to be considered in the industry. In the paper, using simulation and computational fluid dynamics technique, the effect of inlet air pressure on the performance of a vortex tube device has been investigated. To solve the flow field equations, the k-ε turbulence model is used and the model geometry is considered constant. The results show that each vortex pipe has an optimal working pressure that is both economically and economically justifiable. This working pressure was 4.8 bar in the current project. The simulation results show that for cooling purposes, using a mass ratio of 0.3 will cause a higher separation in the cold output and for heating purposes, it is recommended to use a cold mass ratio of about 0.8.
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Investigating the performance and emission of RCCI engines with different compositions and percentages of natural gas
*, Ahmadreza Kargarian Marvasti
Journal of Engine Research, -
Experimental and Numerical studying the effect of ethanol and methanol blend with gasoline on engine emissions
*, Amin Kalhor
Automotive Science and Engineering, Autumn 2019