Flow and heat transfer characteristics of impinging jet from notched orifice nozzle

被引：0

作者：

Shakouchi T. ^{[1
]}

Kito M. ^{[1
]}

Tsuda M. ^{[1
]}

Tsujimoto K. ^{[1
]}

Ando T. ^{[1
]}

机构：

[1] Graduate School of Engineering, Mie University, Tsu-shi, Mie, 514-8507

来源：

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2010年 / 76卷 / 772期

关键词：

Heat transfer enhancement; Impinging jet; Mixing; Notched orifice nozzle; Orifice nozzle;

D O I：

10.1299/kikaib.76.772_2235

中图分类号：

学科分类号：

摘要：

Jet flow from an orifice nozzle is applicable to mixing and entraining of ambient fluid effectively because of a large shearing stress layer with a large velocity gradient at the jet edge due to the vena contracta effect, but the sudden contraction at the nozzle exit accounts for a large flow resistance. The centerline velocity increases to the downstream and reaches to the maximum of 1.2 times of the nozzle exit maximum velocity at about x/d0=2 (d 0: nozzle exit diameter), this is also effective to enhance the heat transfer performance of impinging jet. In order to reduce the flow resistance remaining a vena contract effect, use of a cone orifice nozzle has been considered. In this study, the effects of use of a notch for the orifice nozzle on the flow characteristics are examined experimentally. Hot wire measurements were conducted to demonstrate the spreading or mixing performance of the notched orifice nozzle having a reduced flow resistance of the nozzle and an increasing turbulent intensity more than that for a conventional orifice nozzle. Moreover, heat transfer performance of the impinging jet from an orifice nozzle is made clear and the improvement or enhancement by a notched orifice nozzle and a tapered notched nozzle will be shown by experimental research works.

引用

页码：2235 / 2241

页数：6

共 9 条

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