ResultExperiment 1: Demonstration of filmwise and dropwise condensation

Experiment 2: The filmwise heat flux and surface heat transfer coefficient determination at constant pressure.Flowrate(LPM)Power(W)Tin( C)Tout( C)Tsat( C)Tsurf( C)Tsat-Tsurf( C)Tm( C)(w/m2)U(w/m2.k)

0.15132.533.069.731.937.836.9864.523.4

0.212832.232.368.931.137.836.6346.89.5

0.313132.232.469.630.938.737.31037.927.8

0.414032.232.369.430.838.637.1691.118.6

0.515532.832.769.431.438.036.6864.523.6

Experiment 3: The dropwise heat flux and surface heat transfer coefficient determination at constant pressureFlowrate(LPM)Power(W)Tin( C)Tout( C)Tsat( C)Tsurf( C)Tsat-Tsurf( C)Tm( C)(w/m2)U(w/m2.k)

0.412232.433.469.031.038.036.16911.1191.4

0.811132.533.469.631.238.436.612435.0339.8

1.216333.634.667.932.335.633.820738.2613.6

1.611534.335.268.232.835.433.424894.7745.4

2.010734.535.468.235.033.233.231112.2937.1

Experiment 4: The effect of air inside chamber

For filmwise condenser

Flowrate(LPM)Power(W)Tin( C)Tout( C)Tsat( C)Tsurf( C)Tsat-Tsurf( C)Tm( C)(w/m2)U(w/m2.k)

0.117533.533.663.232.231.029.6173.45.85

0.215534.434.363.332.930.428.9346.812.0

0.37234.234.063.032.430.628.91040.436.0

0.46333.835.963.032.430.628.114515.7516.6

0.513034.033.863.032.130.929.11734.059.6

For dropwise condenser

Flowrate(LPM)Power(W)Tin( C)Tout( C)Tsat( C)Tsurf( C)Tsat-Tsurf( C)Tm( C)(w/m2)U(w/m2.k)

0.416834.134.363.032.230.828.81387.248.2

0.815234.235.063.132.330.828.511047.8387.6

1.213034.235.262.932.530.428.220733.2735.2

1.612834.435.362.732.530.227.824894.7895.5

2.010334.335.362.432.629.827.634555.41250.0

CalculationExperiment 2: FilmwiseVolumetric flowrate= 0.10LPM=0.1 L= =1.667 g/s

Power, qxQx=CT=1.667 g/s4.186kJ/kg.K(33.0-32.5) C=3.49 W

Log mean temperature difference:Tm = ===36.9 C

Heat flux, = = = 864.5 w/m2

Heat transfer coefficient, U = ==23.4 w/m2.K

Volumetric flowrate= 0.20LPM=0.2 L= =3.333 g/s

Power, qxQx=CT=3.333 g/s4.186kJ/kg.K(32.3-32.2) C= 1.40W

Log mean temperature difference:Tm = ===36.6 C

Heat flux, = = = 346.8 w/m2

Heat transfer coefficient, U = ==9.5w/m2.K

Volumetric flowrate= 0.30LPM=0.3 L= =5 g/s

Power, qxQx=CT=5 g/s4.186kJ/kg.K(32.4-32.2) C= 4.19 W

Log mean temperature difference:Tm = ===37.3 C

Heat flux, = = =1037.9 w/m2

Heat transfer coefficient, U = ==27.8 w/m2.K

Volumetric flowrate= 0.40LPM=0.4 L= =6.67 g/s

Power, qxQx=CT=6.67 g/s4.186kJ/kg.K(32.3-32.2) C= 2.79 W

Log mean temperature difference:Tm = ===37.1 C

Heat flux, = = =691.1 w/m2

Heat transfer coefficient, U = ==18.6 w/m2.K

Volumetric flowrate= 0.50LPM=0.5 L= =8.333 g/s

Power, qxQx=CT=8.333 g/s4.186kJ/kg.K(32.8-32.7) C=3.49 W

Log mean temperature difference:Tm = ===36.6 C

Heat flux, = = = 864.5 w/m2

Heat transfer coefficient, U = ==23.6 w/m2.K

Experiment 3: DropwiseVolumetric flowrate= 0.40LPM=0.4 L= =6.67 g/s

Power, qxQx=CT=6.67 g/s4.186kJ/kg.K(33.4-32.4) C= 27.9 W

Log mean temperature difference:Tm = ===36.1 C

Heat flux, = = =6911.1 w/m2

Heat transfer coefficient, U = ==191.4 w/m2.K

Volumetric flowrate= 0.80LPM=0.8 L= =13.33 g/s

Power, qxQx=CT=13.33 g/s4.186kJ/kg.K(33.4-32.5) C= 50.2 W

Log mean temperature difference:Tm = ===36.6 C

Heat flux, = = =12435.0 w/m2

Heat transfer coefficient, U = ==339.8 w/m2.K

Volumetric flowrate= 1.2LPM=1.2L= =20.0 g/s

Power, qxQx=CT=20.0 g/s4.186kJ/kg.K(34.6-33.6) C= 83.72 W

Log mean temperature difference:Tm = ===33.8C

Heat flux, = = =20738.2 w/m2

Heat transfer coefficient, U = ==613.6 w/m2.K

Volumetric flowrate= 1.6LPM=1.6 L= =26.67 g/s

Power, qxQx=CT=26.67 g/s4.186kJ/kg.K(35.2-34.3) C= 100.5 W

Log mean temperature difference:Tm = ===33.4C

Heat flux, = = =24894.7 w/m2

Heat transfer coefficient, U = ==745.4 w/m2.K

Volumetric flowrate= 2.0LPM=2.0L= =33.33 g/s

Power, qxQx=CT=33.33 g/s4.186kJ/kg.K(35.4-34.5) C= 125.6 W

Log mean temperature difference:Tm = ===33.2C

Heat flux, = = =31112.2 w/m2

Heat transfer coefficient, U = ==937.1 w/m2.K

Experiment 4:Filmwise condenser Volumetric flowrate= 0.10LPM=0.1 L= =1.667 g/s

Power, qxQx=CT=1.667 g/s4.186kJ/kg.K(33.6-33.5) C=0.70 W

Log mean temperature difference:Tm = ===29.6 C

Heat flux, = = = 173.4 w/m2

Heat transfer coefficient, U = ==5.85 w/m2.K

Volumetric flowrate= 0.20LPM=0.2 L= =3.333 g/s

Power, qxQx=CT=3.333 g/s4.186kJ/kg.K(34.4-34.3) C= 1.4W

Log mean temperature difference:Tm = ===28.9 C

Heat flux, = = = 346.8 w/m2

Heat transfer coefficient, U = ==12.0 w/m2.K

Volumetric flowrate= 0.30LPM=0.3 L= =5 g/s

Power, qxQx=CT=5 g/s4.186kJ/kg.K(34.2-34.0) C= 4.2 W

Log mean temperature difference:Tm = ===28.9 C

Heat flux, = = =1040.4 w/m2

Heat transfer coefficient, U = ==36.0 w/m2.K

Volumetric flowrate= 0.40LPM=0.4 L= =6.67 g/s

Power, qxQx=CT=6.67 g/s4.186kJ/kg.K(35.9-33.8) C= 58.6W

Log mean temperature difference:Tm = ===28.1 C

Heat flux, = = =14515.7 w/m2

Heat transfer coefficient, U = ==516.6 w/m2.KVolumetric flowrate= 0.50LPM=0.5 L= =8.333 g/sPower, qxQx=CT =8.333 g/s4.186kJ/kg.K(34.0-33.8) C=7.0 W

Log mean temperature difference:Tm = ===29.1 C

Heat flux, = = = 1734.0 w/m2

Heat transfer coefficient, U = ==59.6 w/m2.K

Experiment 4:Dropwise condenserVolumetric flowrate= 0.40LPM=0.4 L= =6.67 g/s

Power, qxQx=CT=6.67 g/s4.186kJ/kg.K(34.3-34.1) C= 5.6 W

Log mean temperature difference:Tm = ===28.8 CHeat flux, = = =1387.2w/m2

Heat transfer coefficient, U = ==48.2 m2.K

Volumetric flowrate= 0.80LPM=0.8 L= =13.33 g/s

Power, qxQx=CT=13.33 g/s4.186kJ/kg.K(35.0-34.2) C= 44.6 W

Log mean temperature difference:Tm = ===28.5 C

Heat flux, = = =11047.8 w/m2

Heat transfer coefficient, U = ==387.6 m2.K

Volumetric flowrate= 1.2LPM=1.2 L= =20.0 g/s

Power, qxQx=CT=20.0 g/s4.186kJ/kg.K(35.2-34.2) C= 83.7 W

Log mean temperature difference:Tm = ===28.2C

Heat flux, = = =20733.2 w/m2

Heat transfer coefficient, U = ==735.2w/m2.K

Volumetric flowrate= 1.6LPM=1.6 L= =26.67 g/s

Power, qxQx=CT=26.67 g/s4.186kJ/kg.K(35.3-34.4) C= 100.5 W

Log mean temperature difference:Tm = ===27.8C

Heat flux, = = =24894.7 w/m2

Heat transfer coefficient, U = ==895.5 w/m2.K

Volumetric flowrate= 2.0LPM=2.0 L= =33.33 g/s

Power, qxQx=CT=33.33 g/s4.186kJ/kg.K(35.3-34.3) C= 139.5 W

Log mean temperature difference:Tm = ===27.6C

Heat flux, = = =34555.4 w/m2

Heat transfer coefficient, U = ==1252.0w/m2.K