Experimental Study on Pool Boiling Heat Transfer in Water Using Sintered Copper Microporous Coatings on Metal Surface

In the parametric study of particle size and coating thickness effect, the maximum NBHT coefficient was measured to be ⁓400 kW/m² k with 67 μm APS and 296 μm coating thickness. This value is about 8 times higher than that of a plain copper surface. The maximum CHF observed was 2.1 MW/m² at APS 67 μm and 428 μm coating thickness, which is about 2 times higher than CHF of a plain copper surface. In the heater orientation effect test, the CHF values of HTCMC were maintained as ⁓2 MW/m² at upward inclination angles from 0° to 90°, whereas the CHF values decreased as the inclination angle changed from 90° to 180°. The CHF values were ⁓1.4 MW/m² at 180°. In the subcooling effect test, the NBHT did not change up to ⁓2,000 kW/m² for the HTCMC test and ⁓⁓1,000 kW/m² for the plain test with the degree of subcooling. The CHF values of HTCMC were maintained about ⁓1,000kW/m² higher than those of plain surface throughout the subcoolings tested.