Study on the Influence of the Microgravity on the Flow and Heat Transfer Characteristics of Gas–Liquid Two-Phase Flow in Evaporator

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE Microgravity Science and Technology Pub Date : 2023-11-29 DOI:10.1007/s12217-023-10084-7

Rui Ma, Jiamin Guo, Yilin Ye, Yuting Wu

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Abstract

In a microgravity environment, the flow pattern, flow characteristics, and heat transfer characteristics of gas–liquid two-phase flow are different from those in a normal gravity environment. To study the influence of microgravity on the flow and heat-transfer characteristics in an evaporator, this study develops a flow and heat-transfer model in an evaporator based on a previously proposed microgravity solution where the refrigerant and lubricating oil are mixed. This work also examines the flow and heat-transfer characteristics of gas–liquid two-phase flow in an evaporator with gravity of 10^–6-10⁻³ g and studies the influence of lubricating-oil content on the flow and heat-transfer characteristics of mixed two-phase flow in the evaporator. The results show that when gravity is equal to 10⁻³ g, the gas volume fraction at the outlet is between 0.6 and 0.7, and when gravity is decreased to 10^–6 g, the gas volume fraction at the outlet of the evaporator, after gradually decreasing, comes close to a zero gravity-state. In addition, the gas volume fraction remains between 0.3 and 0.6. It can also be seen that when gravity increases, the heat-transfer coefficient increases nearly linearly and reaches a maximum value of 14.013 W/(m²·K) and 16.066 W/(m²·K) when the lubricating oil content is 2% for normal gravity, and 4.443 W/(m²·K) and 5.519 W/(m²·K) when the lubricating oil content is 2.5% for microgravity.

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微重力对蒸发器内气液两相流流动及传热特性影响的研究

在微重力环境下，气液两相流的流型、流动特性和换热特性都不同于正常重力环境。为了研究微重力对蒸发器流动和传热特性的影响，本研究基于先前提出的制冷剂和润滑油混合的微重力解决方案，建立了蒸发器流动和传热模型。本文还研究了重力为10-6-10−3 g的蒸发器内气液两相流的流动和传热特性，并研究了润滑油含量对蒸发器内混合两相流流动和传热特性的影响。结果表明:当重力为10 ~ 3 g时，蒸发器出口气体体积分数在0.6 ~ 0.7之间，当重力减小到10 ~ 6 g时，蒸发器出口气体体积分数逐渐减小，接近于重力为零的状态。此外，气体体积分数保持在0.3 ~ 0.6之间。还可以看出，随着重力的增加，传热系数几乎呈线性增加，在正常重力条件下，当润滑油含量为2%时，传热系数达到最大值，分别为14.013 W/(m2·K)和16.066 W/(m2·K);在微重力条件下，当润滑油含量为2.5%时，传热系数分别为4.443 W/(m2·K)和5.519 W/(m2·K)。

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来源期刊

Microgravity Science and Technology 工程技术-工程：宇航

CiteScore

3.50

自引率

44.40%

发文量

期刊介绍： Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology