Effect of Uniformly and Nonuniformly Coated Al₂O₃ Nanoparticles over Glass Tube Heater on Pool Boiling

Table 1

Surface roughness values of different test heaters.

Sample number	Description of test heater	Surface roughness parameters
		1	Plain glass tube	36.23	51.32
2	37.19	51.73
3	36.84	52.79
4	36.59	52.26
5	37.18	51.57
1	Nonuniformly Al2O3 nanoparticles coated glass tube	113.73	150.25
2		114.69	151.06
3		114.87	150.56
4		113.91	151.46
5		113.12	151.39
1	Uniformly Al2O3 nanoparticles coated glass tube	231.63	293.14
2		231.89	293.61
3		232.04	293.23
4		231.19	294.09
5		232.07	294.12