Modeling of Supercritical CO2 Flow Through Short Tube Orifices

[+] Author and Article Information
Chun-Lu Zhang1

Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, No. 1954 Hua Shan Road, Shanghai 200030, Chinaclzhang@sjtu.org

Liang Yang

China R&D Center, Carrier Corporation, #29-06 King Tower, No.28 Xinjinqiao Road, Pudong, Shanghai 201206, Chinaliang.yang@carrier.utc.com


Corresponding author.

J. Fluids Eng 127(6), 1194-1198 (Jul 11, 2005) (5 pages) doi:10.1115/1.2060738 History: Received May 15, 2005; Revised July 11, 2005

The transcritical cycle of carbon dioxide (CO2) is a promising alternative approach to heat pumps and automobile air conditioners. As an expansion device, the short tube orifice in a transcritical CO2 system usually receives supercritical fluid at the entrance and discharges a two-phase mixture at the exit. In this work, a two-fluid model (TFM) is developed for modeling the flow characteristics of supercritical CO2 through the short tube orifice. The deviations between the TFM predictions and the measured mass flow rates are within ±20%. Meanwhile, the TFM predicts reasonable pressure, temperature, and velocity distributions along the tube length. The small values of interphase temperature difference and velocity slip indicate that the nonequilibrium characteristics of the two-phase flow of CO2 in the short tube orifice are not significant. Consequently, the homogeneous equilibrium model reduced from the TFM gives a good prediction of the mass flow rate as well.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

A comparison of measured and TFM predicted mass flow rates

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Figure 2

Pressure distribution along a short tube orifice

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Figure 3

Velocity distribution of phases along a short tube orifice

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Figure 4

Temperature distribution of phases along a short tube orifice

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Figure 5

Density ratios of different refrigerants

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Figure 6

Surface tensions of different refrigerants

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Figure 7

A comparison of measured and HEM predicted mass flow rates




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