Investigations of Flow and Heat Transfer Characteristics in a Channel Impingement Cooling Configuration with a Single Row of Water Jets
Abstract
:1. Introduction
2. Experimental Method
2.1. Flow Loop
2.2. Test Module
2.3. Operating Procedure
2.4. Measurement Uncertainty
3. Numerical Model
3.1. Model Description
3.2. Numerical Method
3.3. Validation of Numerical Model
4. Results and Discussion
4.1. Experimental Results
4.2. Numerical Results
4.2.1. Jet Exit Velocity Variation
4.2.2. Flow Field and Heat Transfer Coefficient
5. Conclusions
- (1)
- Experimental results showed that the average Nusselt number (Nuavg) at the target surface increases with the jet Reynolds number (Rejet) and decreases with the channel height (Hch);
- (2)
- Experimentally measured Nuavg was correlated as a function of Rejet, dimensionless channel height (Hch/Djet), and fluid properties. The correlated Nuavg agreed well within a mean absolute error of 4.31%;
- (3)
- The numerical simulation using the SST k-ω turbulence model can effectively predict experimentally measured overall heat transfer rate of the channel impingement configuration within a 10% error;
- (4)
- Numerical results showed that a jet exit velocity variation occurs along the channel. The jet exit velocity variation was significantly affected by Hch and moderately affected by the average jet velocity (Vjet);
- (5)
- The crossflow inside the channel deflects the jet potential core in the streamwise direction, and the stagnation regions occurred at the downstream location. The jet deflection reduced the stagnation region heat transfer, evident at the downstream located jets. The stagnation region heat transfer coefficient decreased with increasing channel height because the jet loses momentum traveling a long distance to the target surface;
- (6)
- At high Vjet, a stronger wall jet covers the rear section of the stagnation region and the heat transfer at the intervals between stagnation regions increase. However, at high Hch, the jet was unable to penetrate the wall attached crossflow at the downstream location, and peaks in the heat transfer coefficient at the stagnation region faded away;
- (7)
- U-shaped rotating flow structures formed by the wall attached crossflow and upstream jet were observed regardless of Hch and Vjet. Shear interaction between the U-shaped flow structures and the downstream jet caused a detrimental effect on the velocity evolution and induced jet momentum loss.
Author Contributions
Funding
Conflicts of Interest
References
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Djet (mm) | Xjet (mm) | Ljet (mm) | Njet | Wch (mm) | Hch (mm) | Lch (mm) | tcopper (mm) | Htc,1 (mm) | Htc,2 (mm) |
---|---|---|---|---|---|---|---|---|---|
0.8 | 4.8 | 3 | 11 | 2 | 3, 4, 5, 6 | 56 | 4 | 8 | 22 |
Hch (mm) | Vjet (m/s) | Rejet | q″ (W/cm2) | Number of Cases |
---|---|---|---|---|
3 | 2.00–8.27 | 2044–8475 | 13.2–35.4 | 22 |
4 | 1.98–8.35 | 2031–8552 | 14.7–30.5 | 21 |
5 | 2.00–8.31 | 2044–8509 | 13.9–29.7 | 21 |
6 | 2.00–8.28 | 2047–8478 | 12.2–26.4 | 21 |
Number of Elements (×106) | Average Heat Transfer Coefficient (kW/m2-K) |
---|---|
4.62 | 46.96 |
6.78 | 45.18 |
7.94 | 46.27 |
10.25 | 46.58 |
12.34 | 46.45 |
Hch (mm) | Vjet (m/s) | q″ (W/cm2) |
---|---|---|
3, 4, 5, 6 | 1 | 10 |
3, 4, 5, 6 | 5 | 18 |
3, 4, 5, 6 | 9 | 30 |
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Shin, M.-S.; Senguttuvan, S.; Kim, S.-M. Investigations of Flow and Heat Transfer Characteristics in a Channel Impingement Cooling Configuration with a Single Row of Water Jets. Energies 2021, 14, 4327. https://doi.org/10.3390/en14144327
Shin M-S, Senguttuvan S, Kim S-M. Investigations of Flow and Heat Transfer Characteristics in a Channel Impingement Cooling Configuration with a Single Row of Water Jets. Energies. 2021; 14(14):4327. https://doi.org/10.3390/en14144327
Chicago/Turabian StyleShin, Min-Seob, Santhosh Senguttuvan, and Sung-Min Kim. 2021. "Investigations of Flow and Heat Transfer Characteristics in a Channel Impingement Cooling Configuration with a Single Row of Water Jets" Energies 14, no. 14: 4327. https://doi.org/10.3390/en14144327