化工进展 ›› 2019, Vol. 38 ›› Issue (07): 3065-3071.DOI: 10.16085/j.issn.1000-6613.2019-0039

• 化工过程与装备 • 上一篇    下一篇

影响纳米流体液滴蒸发沉积图案的关键因素分析

柴琳(),刘斌(),杨文哲,陈爱强,邹同华   

  1. 天津商业大学天津市制冷技术重点实验室,天津 300134
  • 收稿日期:2019-01-07 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: 刘斌
  • 作者简介:柴琳(1994—),女,硕士研究生,研究方向为热质传递过程及强化换热技术。E-mail:<email>chailinKylin@163.com</email>。
  • 基金资助:
    天津市自然科学基金重点项目(16JCZDJC31500);国家自然科学基金青年科学基金(5170061054)

Analysis of the key factors affecting the deposition pattern of the nanofluid droplet

Lin CHAI(),Bin LIU(),Wenzhe YANG,Aiqiang CHEN,Tonghua ZOU   

  1. Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China
  • Received:2019-01-07 Online:2019-07-05 Published:2019-07-05
  • Contact: Bin LIU

摘要:

目前关于液滴蒸发后沉积图案的研究主要集中于描述其物理现象的变化,但是对于蒸发过程中导致沉积图案形成的受力分析少有研究。影响纳米流体液滴蒸发沉积图案的主要因素是与液滴接触的底板温度和纳米颗粒的质量浓度。本文选用4种不同温度(30℃、47℃、64℃和81℃)的玻璃载玻片作为底板,采用粒径为20nm的3种质量分数(0.05%、0.1%和0.2%)的Al2O3-H2O纳米溶液来研究纳米流体液滴在固体表面上蒸发后沉积图案的形成机理。实验结果表明,随着溶液质量分数的增加和底板温度的升高,咖啡圈效应越来越明显,且内环结构也逐渐清晰可见。其中咖啡圈效应由底板温度和溶液质量分数共同影响。溶液质量分数和底板温度都与马兰戈尼(Marangoni)效应呈正相关性,但由停滞点和Marangoni效应产生的内环结构,受底板温度的影响更大。

关键词: 蒸发, 沉积物, 纳米粒子, 氧化铝, 溶液

Abstract:

At present, research on deposition patterns after droplet evaporation mainly focuses on describing changes in physical phenomena. However, little research has been done on the force analysis that leads to the formation of deposition patterns during evaporation. The key factors affecting the deposition pattern of the nanofluid droplet are the substrate temperature and the mass fraction of the nanoparticle in the nanofluid droplet. Based on glass film with four different temperatures (30℃, 47℃, 64℃ and 81℃), the evaporation of aluminum oxide-water mixed liquid drops were studied by using 0.05%, 0.1% and 0.2% mass fraction of aluminum oxide and pure water, and they were used to study the formation mechanism of the deposition pattern of the nanodroplets after evaporation on the solid surface. Results of aluminum oxide-water mixed liquid’s deposition pattern showed that as the mass fraction of the solution increases and the temperature of the substrate increases, the coffee ring effect becomes more and more obvious and the inner ring structure is gradually visible. In addition, the coffee ring effect is affected by the temperature of the bottom plate and the mass fraction of the solution. Although both the mass fraction of the solution and the temperature of the bottom plate are positively correlated with the Marangoni effect, the inner ring structure produced by the stagnation point and the Marangoni effect is more affected by the temperature of the bottom plate.

Key words: evaporation, deposition, nanoparticles, alumina, solution

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