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Numerical simulation of the flow field structure of liquid nitrogen jet

Liquid nitrogen jet (LNJ) is regarded as an excellent technology for the well drilling and reservoir fracturing. To evaluate the flow field structure of LNJ, a two-dimensional computation fluid dynamic model is established. The transient velocity and temperature fields of LNJ is simulated. The results show that the LNJ also clearly presented the velocity boundary and potential core region similar to the water jet. Given the temperature difference between the jet and surrounding fluid, the LNJ has an obvious temperature boundary, on which the jet temperature is equal to the initial value. According to the phase of the jet, the flow structure can be divided into the LNJ and non-LNJ regions. The temperature boundary shows a larger width than the velocity boundary for LNJ. Moreover, both width and length of the LNJ region are greater than the potential core region.
PAPER REVISED: 2018-06-01
PAPER ACCEPTED: 2018-08-10
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