A New LB Model for Solid-liquid Conjugate Boiling Heat Transfer

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A New LB Model for Solid-liquid Conjugate Boiling Heat Transfer

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[1]CAO Hailiang,AN Qi,ZUO Qianlong,et al.A New LB Model for Solid-liquid Conjugate Boiling Heat Transfer[J].Journal of Zhengzhou University (Engineering Science),2023,44(02):75-81.[doi:10.13705/j.issn.1671-6833.2022.05.016]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 02 Page number: 75-81 Column: Public date: 2023-02-27

Title:: A New LB Model for Solid-liquid Conjugate Boiling Heat Transfer

Author(s):: CAO Hailiang; AN Qi; ZUO Qianlong; LIU Hongbei; ZHANG Ziyang; ZHAO Xiaoliang; WANG Peiping; School of Mechanical and Power Engineering, Zhengzhou University, 450001, Zhengzhou, Henan

Keywords:: phase change; solid-liquid conjugate boiling heat transfer model; gas-liquid flow; bubble; LBM

CLC:: N19；TK124

DOI:: 10.13705/j.issn.1671-6833.2022.05.016

Abstract:: To avoid the simulation error caused by the consistent solid-liquid energy transfer rate in the boiling heat transfer LB( lattice Boltzmann) model, different energy transfer rates of solid and liquid are successfully distinguished by tentatively introducing the physical parameters λ, cp of solid and liquid into the temperature relaxation time τ T , as a result, a novel solid-liquid conjugate boiling heat transfer LB model is proposed in this paper. After verifying the accuracy, stability and rationality of the model, boiling heat transfer at different wettability surfaces are simulated by the solid-liquid conjugate model and the original pseudo-potential model. The results show that the unintentional neglection of different heat transfer capacities of solid and liquid regions in the original pseudo-potential model leads to the appearance of large low-density phase transition region around the bubble root. The existence of low-density phase transition region produces additional interphase forces and greatly changes the wall contact angle of bubbles. However, the solid-liquid conjugate heat conduction model realized characterization of different thermophysical properties of solid and liquid regions by introducing a temperature relaxation time function. The low-density phase transition region only appears in a very small range and at very low level, the actual bubble wall contact angles obtained by the conjugate heat transfer model are closer to the setting bubble contact angle. For other wettable surfaces except superhydrophilic surfaces, the maximum relative error of the actual contact angle obtained by the conjugate heat transfer model is 8. 6%, which is 9. 8% lower than that of the original pseudopotential model. The solid-liquid conjugate boiling heat transfer LB model can more accurately describe the actual microscopic process of boiling heat transfer.

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Last Update: 2023-02-25