Control of Heat and Momentum Transport Process by a Reversible Transform Micelle of Polymer
聚合物可逆转变胶束控制热量和动量传输过程
基本信息
- 批准号:09650253
- 负责人:
- 金额:$ 2.05万
- 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:1997
- 资助国家:日本
- 起止时间:1997 至 1998
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
It is well known that Thorns effect in non-Newtonian fluid causes the drag reduction. Recently it has been reported that an addition of small amounts of surfactants also provided the same effect on the drag reduction. The characteristics of drag reduction flow can transport the long distance thermal medium with low energy loss. The mechanism of drag reduction flow has been stilt unexplored, especially for the turbulent flow condition that appears in a practical application. In the present study, experimental study has been performed on the behavior of micelle structure with reversible transform of polymer, and a controlling technique for thermo-fluid phenomena has also developed by using surfactant.Heat transfer characteristics of a dilute surfactant/water solution in a two dimensional channel has been experimentally investigated. Temperature profile measurements in the thermal boundary layer were also made. It was found that high diffusivity layer exists near the wall in the drag reducing thermal boundary layer and that the time scale of temperature fluctuation in the layer becomes smaller as increased of wall heat flux. In order to increase the heat transfer coefficients, the mesh plug was used to exert high shear stress to destroy micelle structure in the surfactant solution so that turbulence could be produced. The mesh plug indicated that the high heat transfer region had the same turbulent intensity as that of water flow. The mesh helped to create high wall shear stress and therefore to destroy the rod-like micelles for introducing turbulent. It was found that the turbulent intensities of the velocity gradually decreased to the same as those of drag reduction flow downstream form the mesh because the mesh plug only produced a local high shear stress. This technique can be applied for effective heat transfer augmentation in a drag reduction flow.
众所周知,非牛顿流体中的Thorns效应是减阻的主要原因。最近,据报道,添加少量的表面活性剂也提供了相同的减阻效果。减阻流动的特点是可以长距离输送热介质,能量损失小。对于减阻流动的机理,特别是对于实际应用中出现的湍流情况,还没有深入的研究。本文对具有可逆相变的聚合物胶束结构的行为进行了实验研究,并发展了表面活性剂对热流体现象的控制技术,对表面活性剂/水稀溶液在二维通道中的传热特性进行了实验研究。还测量了热边界层的温度分布。结果表明,减阻热边界层在近壁处存在高扩散层,且随着壁面热流密度的增大,边界层内温度波动的时间尺度变小。为了提高传热系数,采用网塞施加高剪切力破坏表面活性剂溶液中的胶束结构,使其产生湍流。网格塞表明,高传热区具有与水流相同的湍流强度。该网有助于产生高的壁剪切应力,从而破坏棒状胶束以引入湍流。结果表明,由于网塞仅产生局部高剪切应力,网塞下游的速度湍流强度逐渐降低,与减阻流相同。该技术可用于减阻流中的有效传热强化。
项目成果
期刊论文数量(0)
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Li Pei-Wen, Hisashi Daisaka, Yasuo Kawaguchi, Akira Yabe, Koichi Hishida and Masanobu Maeda: "The Study on Heat Transfer of Surfactant Solution as Drag-Reducing Flow" 第35回日本伝熱シンポジウム講演論文集. Vol.3. 691-692 (1998)
李培文、Hisashi Daisaka、Yasuo Kawaguchi、Akira Yabe、Koichi Hishida 和 Masanobu Maeda:“表面活性剂溶液作为减阻流的传热研究”第 35 届日本传热研讨会论文集第 691 卷。 692 (1998)
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P.W.Li, H.Daisaka, Y.Kawaguchi, A.Yabe, K.Hishida and M.Maeda: "Turbulence Structure of Drag-Reducing Surfactant Solution in Two-Dimensional Channel with Additional Heat Transfer Enhancement Method" Proc.of the 5th ASME/JSME Joint Thermal Engineering Conf
P.W.Li、H.Daisaka、Y.Kawaguchi、A.Yabe、K.Hishida 和 M.Maeda:“采用附加传热增强方法的二维通道中减阻表面活性剂溶液的湍流结构”Proc.of the 5th ASME
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川口靖夫、台坂恒、矢部彰、菱田公一、前田昌信: "抵抗低減流れにおける成層の存在と熱伝達特性" 第34回日本伝熱シンポジウム講演論文集. 355-356 (1997)
Yasuo Kawaguchi、Hisashi Daisaka、Akira Yabe、Koichi Hishida 和 Masanobu Maeda:“减少阻力流中分层和传热特性的存在”第 34 届日本传热研讨会论文集 355-356(1997 年)。
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Kawaguchi,Y.,Daisaka,H.,Li,P.W.,Yabe,A.,Hishida,K.and Maeda,M.: "Study on a Thermal Boundary Layer of Drag Reducing Surfactant Solution-Measurements of Temperature Fluctuation" Proc.of ASME Forum on Measurement Techniques in Multiphase Flows. (1997)
Kawaguchi,Y.,Daisaka,H.,Li,P.W.,Yabe,A.,Hishida,K.and Maeda,M.:“减阻表面活性剂溶液热边界层的研究 - 温度波动的测量”论文集
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Kawaguchi, Y., Daisaka, H., Yabe, A., Hishida, K.and Maeda, M.: "Existence of Double Diffusivity Fluid Layers and Heat Transfer Characteristics in Drag Reducing Channel Flow" Proc.of 2nd.Int.Symposium on Turbulence Heat and Mass Transfer. vol.1-1. 157-166
Kawaguchi, Y.、Daisaka, H.、Yabe, A.、Hishida, K. 和 Maeda, M.:“减阻通道流中双扩散流体层的存在和传热特性”Proc.of 2nd.Int.Symposium
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HISHIDA Koichi其他文献
HISHIDA Koichi的其他文献
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{{ truncateString('HISHIDA Koichi', 18)}}的其他基金
Development of Micro/Nanoscale Thermofluid Multiple Sensing and Interface-Controlled Device
微/纳米级热流体多重传感与接口控制装置的研制
- 批准号:
21226006 - 财政年份:2009
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (S)
Establishment of Micro/Nanoscale Imaging Technique for Anisotropic Extraction of Interfacial Convective Diffusion Phenomena
界面对流扩散现象各向异性提取微纳成像技术的建立
- 批准号:
18206024 - 财政年份:2006
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
MONITORING AND ACTIVE CONTROL OF HEAT AND MASS TRASFER IN MICRO- AND NANOSCALE
微米级和纳米级传热传质的监测和主动控制
- 批准号:
15206024 - 财政年份:2003
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Research Development of Multiple Valuable Imaging in Micro-Thermofluid Devices
微热流体装置多重有价值成像的研究进展
- 批准号:
13555057 - 财政年份:2001
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Active Control of Heat and Mass Transfer using Functional Jets Array
使用功能射流阵列主动控制传热传质
- 批准号:
13450088 - 财政年份:2001
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Structure of Heat and Mass Transfer process in Turbulent Bubbly Flow by Combined Laser Imaging.
通过组合激光成像研究湍流气泡流中的传热传质过程结构。
- 批准号:
11450088 - 财政年份:1999
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
Research Development of multi-dimensional combined measurement in heat and fluid flow by multi-layer imaging.
多层成像热流与流体流多维联合测量研究进展
- 批准号:
10555062 - 财政年份:1998
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
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