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Experimental Study of Condensation on Micro Grooved Plates

Experimental Study of Condensation on Micro Grooved Plates. R. Barron-jimenez, H. Y. Hu, G. P. Peterson Department of Mechanical Engineering Texas A&M University. Overview. Introduction Experimental System Apparatus Test Plates Test Conditions Results

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Experimental Study of Condensation on Micro Grooved Plates

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  1. Experimental Study of Condensation on Micro Grooved Plates R. Barron-jimenez, H. Y. Hu, G. P. Peterson Department of Mechanical Engineering Texas A&M University

  2. Overview • Introduction • Experimental System • Apparatus • Test Plates • Test Conditions • Results • Overall Condensation Heat Transfer Coefficient • Condensate Removal • Conclusions

  3. Scientific Interest Optimum geometry to take advantage of the surface tension Effect of vapor shear during condensation Role of gravitational body force during condensation Applications Condensate removal Thin film Retain liquid Enhance capillary pumping in micro heat pipes Micro Grooves Better understanding of the condensation phenomena

  4. Experimental Apparatus

  5. Experimental Apparatus

  6. Experimental Apparatus

  7. Experimental Apparatus

  8. Test Plates Micro Grooves Geometry

  9. Test Plates

  10. Test Plates

  11. Test Conditions • Vapor velocity : 4.14±0.64 m/s • Re (transition regime) : 3.474*103 • System pressure : 101.35 kPa • Plate orientation : Horizontal • Cooling Temperature : 20, 35, 50, or 65ºC

  12. Test Conditions Constant Plate Temperature Assumption

  13. Results Overall Condensation Heat Transfer Coefficient Plate 5 vs. 3 (W) : 1.75 and 2.9 times larger q = 60º vs. 45º : 1.55 better

  14. Results Overall Condensation Heat Transfer Coefficient Average Uh: 52%

  15. Results Condensate Removal Micro grooves in plate 5 are better than smooth surface

  16. Conclusions • Data is not conclusive. Further work is recommended • Large micro grooves with 60º apex angles tend to work better (best performance: Plate 5) • Tests conditions improve the micro grooves performance • Micro grooves help to maintain a stable condensation pattern • Eliminate “wall channel” effect and reduce heat losses

  17. Questions? ¿ ¿ ? ?

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