Two-Phase Heat Transfer Laboratory Texas A&M University Experimental Study of Condensation on Micro Grooved Plates R. Barron-jimenez, H. Y. Hu, G. P. Peterson.

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Two-Phase Heat Transfer Laboratory Texas A&M University 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

Two-Phase Heat Transfer Laboratory Texas A&M University Overview Introduction Experimental System –Apparatus –Test Plates –Test Conditions Results –Overall Condensation Heat Transfer Coefficient –Condensate Removal Conclusions

Two-Phase Heat Transfer Laboratory Texas A&M University Micro Grooves 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 Better understanding of the condensation phenomena

Two-Phase Heat Transfer Laboratory Texas A&M University Experimental Apparatus

Two-Phase Heat Transfer Laboratory Texas A&M University Experimental Apparatus

Two-Phase Heat Transfer Laboratory Texas A&M University Experimental Apparatus

Two-Phase Heat Transfer Laboratory Texas A&M University Experimental Apparatus

Two-Phase Heat Transfer Laboratory Texas A&M University Test Plates Micro Grooves Geometry

Two-Phase Heat Transfer Laboratory Texas A&M University Test Plates

Two-Phase Heat Transfer Laboratory Texas A&M University Test Plates

Two-Phase Heat Transfer Laboratory Texas A&M University Test Conditions Vapor velocity :4.14±0.64 m/s Re (transition regime) :3.474*10 3 System pressure : kPa Plate orientation :Horizontal Cooling Temperature : 20, 35, 50, or 65ºC

Two-Phase Heat Transfer Laboratory Texas A&M University Test Conditions Constant Plate Temperature Assumption

Two-Phase Heat Transfer Laboratory Texas A&M University Results Overall Condensation Heat Transfer Coefficient Plate 5 vs. 3 (W) : 1.75 and 2.9 times larger  = 60º vs. 45º : 1.55 better

Two-Phase Heat Transfer Laboratory Texas A&M University Results Overall Condensation Heat Transfer Coefficient Average U h : 52%

Two-Phase Heat Transfer Laboratory Texas A&M University Results Condensate Removal Micro grooves in plate 5 are better than smooth surface

Two-Phase Heat Transfer Laboratory Texas A&M University 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

Two-Phase Heat Transfer Laboratory Texas A&M University Questions? ¿ ¿ ? ?

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