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Effect of adiabatic length on the performance of closed-loop thermosyphon system

机译：绝热长度对闭环热水脊柱系统性能的影响

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摘要

This paper reports the effect of different adiabatic lengths on the thermal performance of loop thermosyphon with different filling ratios (FRs) and heat inputs. The carbon steel thermosyphon loop for three different adiabatic lengths is used in this analysis. The loop with plate-type, forced air-cooled condenser, along with two vertical inline evaporators, is filled and tested with distilled water. The transient and steady-state analyses are carried out to understand the thermal behavior of the loop. The thermal resistance is found to be lowest at 800-mm adiabatic length and 60% FR. The geyser boiling phenomenon is also noticed in the present thermosyphon loop. The period of oscillation and temperature fluctuations in the evaporator and condenser increase with the adiabatic length. The geyser boiling phenomenon may disappear at a very small adiabatic length of the loop thermosyphon with forced air-cooled condenser. This paper proposes a mathematical model for the loop thermosyphon in terms of the Nusselt number, the Reynolds number, the Prandtl number, and the adiabatic length-to-diameter ratio, and the comparative study shows that proposed model validates the experimental results. Also, it is found that the adiabatic length-to-diameter ratio inversely varies with the Nusselt number.
机译：本文报道了不同绝热长度对具有不同灌装比（FRS）和热输入的环热磷热性能的影响。在该分析中使用三种不同绝热长度的碳钢热循环环。用蒸馏水填充和测试具有板式，强制风冷冷凝器的环，具有两个垂直的内联蒸发器。进行瞬态和稳态分析以了解环路的热行为。发现热阻在800mm绝热长度和60％FR下最低。在本热水脊柱环中还注意到了喷泉沸腾现象。蒸发器中的振荡和温度波动的时期和冷凝器随绝热的长度而增加。喷泉沸腾现象可以在带有强制风冷冷凝器的环热磷酸磷酸孔的非常小的绝热长度下消失。本文提出了在露珠数，雷诺数，普朗特数和绝热长度与直径比中的环热循环的数学模型，比较研究表明，提出的模型验证了实验结果。而且，发现绝热长度比与营养数相同。

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