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| 1 | Experimental Investigation and Visualization Study of the Condensation Characteristics in a Propylene Loop Heat Pipe显示文摘At present,the structural design of a loop heat pipe(LHP)condenser mostly relies on experience.To analyze the condensation flow pattern in an LHP and to find a more accurate empirical correlation that can better guide condenser design in existing empirical correlations,a test system was designed and fabricated to observe the condensation phenomenon in the condenser and to evaluate the LHP’s heat transfer performance.Since propylene has a wide temperature range to different temperature control requirements,it was chosen as the working fluid.In this paper,the condensation process in the condenser was observed,and the operating parameters of a propylene LHP were measured at 283 K.The condensation flow patterns in the 2.5 mm×2.5 mm channel mainly included stratified flow,wavy flow and intermittent flow.By comparing the experimental results with four typical condensation flow regime maps,it was found that the Breber and Cavallini flow regime maps can successfully predict most of the condensation flow patterns of the LHP even with ultra-small mass flux.In addition,four condensation heat transfer coefficient correlations were selected to compare the predicted values of heat transfer coefficient with the experimental results.The study showed that the predicted values from the correlation by Cavallini et al.matched 90%of the experimental values well with an error of less than 20%,and this correlation is recommended for highly accurate LHP design. | YAN Kaifenu XIE Rongjian LI Nanxi XU Guangming WU Yinong | 2021 | Journal of Thermal Science2021，30，5： | 1 |
| 2 | A Review on Thermal Design of Liquid Droplet Radiator System显示文摘Liquid Droplet Radiator (LDR) system is regarded as a quite promising waste heat rejection system for aerospace engineering.A comprehensive review on the state-of-the-art of LDR system was carried out.The thermal design considerations of crucial components such as working fluid,droplet generator and collector,intermediate heat exchanger,circulating pump and return pipe were reviewed.The state-of-the-art of existing mathematical models of radiation and evaporation characteristics of droplet layer from literatures were summarized.Furthermore,thermal designs of three LDR systems were completed.The weight and required planform area between the rectangular and triangular LDR systems were respectively compared and the evaporation models for calculating the mass loss were evaluated.Based on the review,some prospective studies of LDR system were put forward in this paper. | CHONG Daotong ZHU Maoguo ZHAO Quanbin CHEN Weixiong YAN Junjie | 2021 | Journal of Thermal Science2021，30，2： | 1 |
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