| Citation: | LI Yongxin, HE Yongqing, DAI Feng, et al. Calculation of the dry-out heat flux of a horizontal microcolumn evaporator under hot spot conditions[J]. Journal of Aerospace Power, 2025, 40（10）：20230530 doi: 10.13224/j.cnki.jasp.20230530
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Based on existing dry-out heat flux model, the research model of dry-out heat flux of horizontal microcolumn evaporator with a relative error of about 7.6% was obtained by combining the capillary pressure and permeability calculation methods under the hot spot effects. The evaporator surface was divided into evaporative, non-evaporative and hot spot areas, and the effects of evaporator geometry, hot spot area and superheat on the heat flux to dryness were investigated. Calculated results showed that the maximum heat transfer capacity depended on the equilibrium relationship between capillary pressure and permeability; microcolumns with geometries close to the optimal pitch ratio (～0.25) and higher corresponded to better heat dissipation, and microcolumns with the smallest receding contact angle corresponded to an enhancement of the heat flux of desiccation by a factor of about two. The modelled superheat was negatively correlated with the hotspot area, with larger hotspot areas corresponding to smaller superheat, and larger local pressures corresponding to larger
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