Flow and Heat Transfer Characteristics of Hydrophobic and Hydrophilic Microchannel Flow

疏水和亲水微通道流动的流动和传热特性

基本信息

  • 批准号:
    16560174
  • 负责人:
  • 金额:
    $ 2.37万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2004
  • 资助国家:
    日本
  • 起止时间:
    2004 至 2005
  • 项目状态:
    已结题

项目摘要

Characteristics of single and two-phase flow in hydrophobic and hydrophilic microchannels were investigated in the laminar flow range. The hydrophobic microchannel was made by a glass tube coated with a silicone. Drag reduction did not occur in degassed tap water flowing in pipes with the smooth hydrophobic surface by measuring the pressure drop. Experiments in two-phase flow (nitrogen and tap water) were carried out to measure the total pressure drop and the flow pattern by using a microscope and a high-speed VTR system. For small liquid flow rate, total pressure drop in the hydrophobic microchannel was much higher as compared with the normal channel. That flow pattern was small liquid and gas segments flowing in the pipe without liquid film. The separation and adhesion of the liquid on the solid wall at both ends of liquid slug, caused larger drag than the slug flow with liquid film. Meanwhile, in the hydrophilic surface, a bursting of liquid film is expected to be hard to arise. The hydrophilic microchannel two-phase flow is more expectative for a drag reduction than the hydrophobic channel. However, it was too difficult to make a hard photocatalytic TiO_2 coating inside of a microchannel for a hydrophilic surface.
在层流范围内研究了疏水性和亲水性微通道内的单相和两相流动特性。疏水微通道由涂有硅酮的玻璃管制成。通过测量压降,发现在具有光滑疏水表面的管道中流动的脱气自来水没有发生减阻。利用显微镜和高速录像系统对氮气和自来水两相流进行了实验研究,测量了两相流的总压降和流型。当液体流量较小时,疏水微通道内的总压降比普通微通道高得多。该流型为小液段和小气段在管内流动,无液膜。液弹两端固体壁面上液体的分离和粘附,造成了比有液膜弹状流更大的阻力。同时,在亲水性表面中,预计难以出现液膜破裂。亲水性微通道两相流比疏水性微通道具有更好的减阻效果。然而,对于亲水性表面,在微通道内制备硬质光催化TiO_2涂层太困难。

项目成果

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SUZUKI Yuji其他文献

SUZUKI Yuji的其他文献

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{{ truncateString('SUZUKI Yuji', 18)}}的其他基金

Analyses on Environmental Behavior of Perfluorinated Compounds including Their Formation Potentials from Precursors
全氟化合物的环境行为包括前体形成潜力的分析
  • 批准号:
    16K21123
  • 财政年份:
    2016
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Improvement of photosynthetic capacity by an enhancement of ATP synthesis in rice
通过增强水稻 ATP 合成来提高光合作用能力
  • 批准号:
    22780055
  • 财政年份:
    2010
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Enhancement of Rubisco content of rice leaves by an overexpression of rbcS
通过 rbcS 的过度表达提高水稻叶片的 Rubisco 含量
  • 批准号:
    19780047
  • 财政年份:
    2007
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
On Chemical Quenching Mechanisms in Microscale Combustion
微尺度燃烧中的化学淬火机理研究
  • 批准号:
    19360094
  • 财政年份:
    2007
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Basic development research on seismic electret power generation system with micro combustion engine
微型内燃机地震驻极体发电系统基础开发研究
  • 批准号:
    17360092
  • 财政年份:
    2005
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Research on carcinogenesis modifying factor by static magnetic field exposure
静磁场暴露致癌调节因子的研究
  • 批准号:
    16590486
  • 财政年份:
    2004
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
A new method for evaluation of neurotoxicological chemicals
神经毒理学化学物质评价的新方法
  • 批准号:
    13670344
  • 财政年份:
    2001
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Basic Study on Active-Feedback Control of Non-Linear Heat and Fluid Flow
非线性热量和流体流动主动反馈控制的基础研究
  • 批准号:
    10555055
  • 财政年份:
    1998
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
A NEW NEUROTOXICOLOGICAL TEST SYSTEM USING NERVE CELL LINE
使用神经细胞系的新型神经毒理学测试系统
  • 批准号:
    10670366
  • 财政年份:
    1998
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Development of Microchannel Heat Exchanger for Refrigeration
制冷用微通道换热器的研制
  • 批准号:
    09555071
  • 财政年份:
    1997
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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