Flow visualization was performed to give a physical insight with vortical structures of an axisymmetric impinging jet on a concave surface. High-speed imaging was employed to get clear images with a laser light sheet illumination. An axisymmetric jet is issued into quasi-ambient air through a straight pipe nozzle with fully-developed velocity profile. A regular vertical pattern of an axisymmetric jet was observed with different flow entrainment rate. While an impinged jet turns to convert a wall jet along a concave surface, the flow interaction between the large-scale toroidal vortex and the concave surface was observed in the transition between the stagnation and wall jet zone. The ring-shaped wall eddies induced from a pair of toroidal vortices were also appeared to diverge into the radial direction along the concave surface. As the jet Reynolds number increases, small-scale vortices can be developed to a large-scale toroidal vortex. The location in which a large-scale toroidal vortex strikes is generally identical to the location where the secondary peak in heat transfer occurs. The frequency of large scale toroidal vortex on concave surface is found to be nearly similar as that of wall jet on flat surface. As the nozzle-to-target spacing (L/D) increases, it becomes shorter due to the loss of jet momentum. The flow behavior of axisymmetric impinging jet on a concave surface can be helpful to design the internal passage cooling for gas turbine blade.
Skip Nav Destination
Article navigation
Photo Gallery
Flow Visualization of Axisymmetric Impinging Jet on a Concave Surface
Dong Hwan Shin,
Dong Hwan Shin
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
dhshin@kimm.re.kr
dhshin@kimm.re.kr
Search for other works by this author on:
Yeonghwan Kim,
Yeonghwan Kim
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
kyh8426@kimm.re.kr
kyh8426@kimm.re.kr
Search for other works by this author on:
Jin Sub Kim,
Jin Sub Kim
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
jskim129@kimm.re.kr
jskim129@kimm.re.kr
Search for other works by this author on:
Do Won Kang,
Do Won Kang
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
kdwon@kimm.re.kr
kdwon@kimm.re.kr
Search for other works by this author on:
Jeong Lak Sohn,
Jeong Lak Sohn
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
jeongl@kimm.re.kr
jeongl@kimm.re.kr
Search for other works by this author on:
Jungho Lee
Jungho Lee
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
jungho@kimm.re.kr
jungho@kimm.re.kr
Search for other works by this author on:
Dong Hwan Shin
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
dhshin@kimm.re.kr
dhshin@kimm.re.kr
Yeonghwan Kim
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
kyh8426@kimm.re.kr
kyh8426@kimm.re.kr
Jin Sub Kim
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
jskim129@kimm.re.kr
jskim129@kimm.re.kr
Do Won Kang
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
kdwon@kimm.re.kr
kdwon@kimm.re.kr
Jeong Lak Sohn
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
jeongl@kimm.re.kr
jeongl@kimm.re.kr
Jungho Lee
Department of Energy Conversion Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Korea
jungho@kimm.re.kr
jungho@kimm.re.kr
1Corresponding author.
J. Heat Transfer. Aug 2018, 140(8): 080902
Published Online: July 2, 2018
Article history
Received:
April 30, 2018
Revised:
May 9, 2018
Citation
Shin, D. H., Kim, Y., Kim, J. S., Kang, D. W., Sohn, J. L., and Lee, J. (July 2, 2018). "Flow Visualization of Axisymmetric Impinging Jet on a Concave Surface." ASME. J. Heat Transfer. August 2018; 140(8): 080902. https://doi.org/10.1115/1.4040394
Download citation file:
158
Views
Get Email Alerts
Cited By
Entropic Analysis of the Maximum Output Power of Thermoradiative Cells
J. Heat Mass Transfer
Molecular Dynamics Simulations in Nanoscale Heat Transfer: A Mini Review
J. Heat Mass Transfer
Related Articles
Numerical Simulation of Oblique Air Jet Impingement on a Heated Flat Plate
J. Thermal Sci. Eng. Appl (March,2017)
An Experimental Investigation on Heat Transfer Characteristics of Hot Surface by Using CuO–Water Nanofluids in Circular Jet Impingement Cooling
J. Heat Transfer (January,2018)
Jet Impingement Cooling of Chips Equipped With Multiple Cylindrical Pedestal Fins
J. Electron. Packag (September,2007)
Related Proceedings Papers
Related Chapters
Adding Surface While Minimizing Downtime
Heat Exchanger Engineering Techniques
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Control and Operational Performance
Closed-Cycle Gas Turbines: Operating Experience and Future Potential