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Research on pressure drop characteristics of CO2 flow boiling based on flow pattern in horizontal Minichannel

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Abstract

The experimental study of the frictional pressure drop characteristics of flow boiling heat transfer of CO2 in a horizontal minichannel with an inner diameter of Φ1.5 mm was carried out. Experimental conditions: heat flux (7.5 ~ 30 kW•m−2), mass flow rate (50 ~ 600 kg•m−2•s−1), saturation temperature (−40 ~ 0 °C), vapor quality (0 ~ 1). The comparison between the experimental results and theoretical flow pattern diagrams shows that the change of heat flux has little effect on the frictional pressure drop at high vapor quality area, but it has a decisive effect on the dryout and mist flow areas. The mass flow rate is the most important factor affecting the frictional pressure drop which has a decisive effect on the flow pattern experienced during the heat transfer process. The saturation temperature has an important influence on the flow pattern transition characteristics and the friction pressure drop decreases with the increase of saturation temperature. The influence of vapor quality on the frictional pressure drop is mainly caused by the flow pattern change in the minichannel. The flow visualization study shows that the theoretical flow pattern diagram can better reflect the flow pattern of CO2 in the phase-change heat transfer process and the transition trend of flow pattern under different working conditions.

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Abbreviations

c p :

Specific heat, J•kg−1•K−1.

D :

Hydraulic diameter, m

D :

Hydraulic diameter, m

G :

Mass flow rate, kg•m−2•s−1

g :

Gravity acceleration, m•s−2

k :

Thermal conductivity, W•m−1•K−1

L :

Test section length, m

m :

Mass flux, kg•s−1

h :

Enthalpy, kJ•kg−1

q :

Heat flux, W•m−2

T :

Temperature, °C

x :

Vapor quality

∆P :

Pressure drop

λ :

Prediction accuracy, %

MAD :

Mean absolute deviation, %

RAD :

Mean relative deviation, %

ρ :

Density, kg/m3

ε :

Uncertainty degree

σ :

Surface tension, N/m

α :

Vapor void fraction

a :

Acceleration

F :

Frictional

pre :

Preheat

sul :

Subcool

tp :

Two-phase

l :

Liquid phase

lv :

Latent heat

leak :

Leakage heat

r :

refrigeration

x :

Mid-position

in :

Inner

out :

Outer

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Authors and Affiliations

  1. Refrigeration Technology Institute, University of Shanghai for Science and Technology, Shanghai, People’s Republic of China

    Zhang Liang, Liu Jianhua, Yuan Yunxiao & Zhang Jiawen

  2. Nantong Vocational University, Shanghai, 200093, People’s Republic of China

    Jiang Linlin

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  1. Zhang Liang
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  2. Jiang Linlin
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  3. Liu Jianhua
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  4. Yuan Yunxiao
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  5. Zhang Jiawen
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Correspondence to Zhang Liang.

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Liang, Z., Linlin, J., Jianhua, L. et al. Research on pressure drop characteristics of CO2 flow boiling based on flow pattern in horizontal Minichannel. Heat Mass Transfer 56, 2939–2952 (2020). https://doi.org/10.1007/s00231-020-02904-y

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  • DOI: https://doi.org/10.1007/s00231-020-02904-y

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