Experimental Determination of Heat Transfer Coefficient in Stirred Vessel for Coal-Water Slurry Based on the Taguchi Method

Table 7

Analysis of variance (ANOVA) for heat transfer coefficient.

Factor	Sum of squares (SS)	Degrees of freedom	Variance (𝑉)	𝐹-ratio	𝐹0.05	Pure sum of squares (SS′)	Percent contribution in % (𝑝)
Stirrer speed	26029.70	2	13014.85	246.02*	3.55	25923.89	45.65
Stirrer location	203.50	2	101.75	1.92	3.55	97.70	0.17
D/d ratio	27139.22	2	13569.61	256.51*	3.55	27033.42	47.60
C-w ratio	2467.07	2	1233.54	23.32*	3.55	2361.26	4.16
Errors	952.23	18	52.90	—	—	1375.45	2.42
Total	56791.72	26	—	—	—	56791.72	100

Tabulated 𝐹-ratio at 95% confidence level: 𝐹 (0.05, 2, 18) = 3.55.
*Significant at 95% confidence level.