Heat Transfer Enhancement of Round Impinging Jet by Orifice Nozzle (Effects of Contraction Area Ratio)

被引：0

作者：

Kito, Mizuki ^{[1
]}

Shakouchi, Toshihiko ^{[1
]}

Sakamoto, Tatsuji ^{[1
,2
]}

Tsujimoto, Koichi ^{[1
]}

Ando, Toshitake ^{[1
]}

机构：

[1] Mie Univ, Grad Sch Engn, Tsu, Mie 5148507, Japan

[2] Mie Univ, Grad Sch Engn, Tsu, Mie 5148507, Japan

来源：

HEAT TRANSFER-ASIAN RESEARCH | 2008年 / 37卷 / 08期

关键词：

impinging jet; nozzle; circular orifice; nozzle contraction effect; heat transfer; shear flow; flow visualization;

D O I：

10.1002/htj.20225

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The effects of the nozzle contraction ratio on the flow and heat transfer characteristics of an orifice impinging jet were investigated in this experiment. The nozzle diameter was d(o) = 10.0 mm = const., and the contraction area ratio CR = (d(o)/d(i))(2), where d(i) is the inner pipe diameter was varied from CR = 1.00 to 0.11 and the nozzle- plate distance was varied from H/d(o) = 2.0 to 5.0. The nozzle Reynolds number was Re = 1.5 x 10(4) = const. The flow characteristics were clarified by measuring the pressure and velocity distributions on the plate and flow visualization. The Nusselt number obtained from measuring the temperature distribution on the plate of an orifice impinging jet with a CR of 0.11 and 0.69 were respectively larger by 19% and 9% than those of a pipe impinging jet (CR = 1.00), because the centerline velocity of the orifice jet was larger than that of the pipe jet. Under the same operation power, an orifice impinging jet has improved heat transfer characteristics. (C) 2008 Wiley Periodicals, Inc.

引用

页码：445 / 459

页数：15

共 8 条

[1] Three-dimensional heat transfer of a confined circular impinging jet with buoyancy effects [J].