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PIVを用いたマイクロチャンネル熱交換器内の流動特性に関する実験的研究

基于PIV的微通道换热器流动特性实验研究

基本信息

批准号：
13750140
负责人：
中山浩
金额：
$ 1.41万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13750140/
关键词：
気液二相流セミマイクロチャンネル気液分配特性流動様式

项目摘要

平成14年度は,平成13年度に引き続きマイクロチャンネル熱交換器を模擬したテスト流路を製作し,非加熱の状態で気液二相流を対象とした実験実験を行った.気相には窒素を用い,液相には水を用いた.このセミマイクロチャンネル内の窒素-水系等温二相流における基本的な流動特性を実験的に明らかにした.流路系は主管・分岐管ともに偏平断面を持つ狭間隙流路であり,主管の流路幅は10mm,分期間の流路幅は6mm,流路間隙Cは流体の粘性や表面張力の影響が顕著となる200μmまで狭くし,主管における見かけの液相速度j_<lm>を0.2〜1.0m/s,見かけの気相速度j_<gm>を0.7〜18m/sに設定し,各管における流動様相の観察,各分岐管への気相・液相分配割合の計測,ボイド率計測,圧力分布計測を行い,マイクロチャンネル内の気液二相流における主管から分岐管への分配メカニズムの検討と等分配に向けての流路形状の改善提案を行った.主な結果を以下に示す.1.分岐管への液相分配特性はj_<gm>に依存して変化する.j_<gm>が低い場合,C=200μmでは液相は全分岐管への均等分配に近づくが,Cが大きくなると液相は最上流(第1)と最下流(第5)分岐管へ選択的に分配され,他の分岐管へはほぼ均等分配になる.j_<gm>が高い場合には,液相分配率は流路間隙に依存しなくなり,いずれのCでも第1及び第5分岐管への分配率が高くなる.2.分岐直前の主管と分岐直後の支管における局所ボイド率は流路間隙を狭くするほど高くなるが,両者の間には流路間隙が広い場合の流路と同程度の良好な相関があることを確認した.3.主管,分岐部,通過部での圧力損失を明らかにし,圧力特性は気液分配特性,ボイド率分布と密接な関係があることを明らかにし,気液等分配のメカニズムについて考察を行った.

In 2014, Heisei 13, the simulation of heat exchanger flow path was carried out, and the simulation of liquid two-phase flow in non-heated state was carried out. The liquid phase is used in the liquid phase. The basic flow characteristics of isothermal two-phase flow in water system are discussed in detail. Flow path system: main pipe, branch pipe, flat cross section, narrow gap flow path, main pipe flow path width 10mm, branch flow path width 6mm, flow path gap C, viscosity of fluid, surface tension effect, narrow gap 200μm, The velocity of liquid phase in main pipe is <lm>0.2 ~ 1.0m/s, the velocity of gas phase in main pipe is <gm>0.7 ~ 18m/s, the flow phase in each pipe is observed, the separation of gas phase and liquid phase in each branch pipe is measured, the emission rate is measured, Pressure distribution measurement, gas and liquid two-phase flow in the main manifold distribution, distribution and other distribution to improve the shape of the flow path The main results are as follows: 1. The liquid phase distribution characteristics of the manifold are dependent on j<gm>_m. <gm>When j_m is low,C=200μm, the liquid phase distribution characteristics of the manifold are close to that of the whole manifold. C. The distribution of liquid phase in the most upstream (1st) and the most downstream (5th) <gm>manifold is equal to that in the other manifold. In the high case, the distribution rate of liquid phase depends on the gap in the flow path. The distribution ratio of the 1st and 5th branch pipes in the middle of the C is high. 2. The main branch pipe of the branch pipe is straight. The distribution ratio of the branch pipe is high. The gap of the flow path is narrow. the flow path gap between the two sides of the channel is different, and the flow path in the same situation is good. the correlation between the two sides of the channel is good. The pressure loss of the passage part is not clear, the pressure characteristics and the distribution characteristics of the gas liquid are not clear, the distribution characteristics of the gas liquid are not clear, and the distribution characteristics of the gas liquid are not clear.