Containerless Solidification of a Hollow Droplet with Forced Convection

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE Microgravity Science and Technology Pub Date : 2024-05-09 DOI:10.1007/s12217-024-10112-0

Nang X. Ho, Binh D. Pham, Truong V. Vu

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Abstract

The phenomenon of solidified suspended hollow droplets is often run into industry and nature. In this study, we focus on the containerless solidification process of a hollow droplet undergoing a forcing flow. We found that when the radius ratio (R_io) varied with different growth angles, it changes the trend of the solidification rate of the solidifying front over time. Specifically, with the growth angle of 5° (i.e., Φ_gr = 5°), the suspended hollow droplets finished solidification in almost the same time for R_io in the range of 0.2–0.7. When we increase the growth angle by 5°, i.e., Φ_gr = 10°, the solidification time increases with the increase of R_io. Also following the increase of R_io, this increase in the solidification time is even higher for the growth angle Φ_gr = 15°. The inlet temperature is also considered. Obviously, increasing the inlet temperature increases the solidification time of the hollow droplets. In addition, when the Reynolds number increases, the solidification time of the droplets also tends to increase. However, the increment of this trend is different under different temperatures of the forcing flow.

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利用强制对流实现中空液滴的无容器凝固

工业和自然界中经常会出现悬浮空心液滴凝固的现象。在这项研究中，我们重点研究了空心液滴在强制流作用下的无容器凝固过程。我们发现，当半径比（Rio）随不同的生长角变化时，会改变凝固前沿的凝固速率随时间变化的趋势。具体来说，当生长角为 5°（即 Φgr = 5°）时，当 Rio 在 0.2-0.7 范围内时，悬浮空心液滴在几乎相同的时间内完成凝固。当我们将生长角增加 5°，即 Φgr = 10°时，凝固时间随着 Rio 的增加而增加。同样，随着 Rio 的增加，在生长角 Φgr = 15° 时，凝固时间的增加幅度更大。还考虑了入口温度。很明显，提高入口温度会增加空心液滴的凝固时间。此外，当雷诺数增加时，液滴的凝固时间也有增加的趋势。然而，在不同的强制流温度下，这一趋势的增量是不同的。

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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