Effects of Centrifugal Buoyancy and Reynolds Number on Turbulent Heat Transfer in a Two-Pass Angled-RIB-Roughened Channel with Sharp 180° Turns Investigated by Using Large Eddy Simulation

Table 1

Dimensionless number range of this study and the duct-averaged values of Nu_𝑚 and 101×101×1569 (the values in parentheses in the second line are for higher grid resolution of Re_∗. The values with asterisks are for quasi-DNS).

Rib arrangement	Ro∗	Ra∗	Re𝑚	Ro𝑚	Gr𝑚,𝑞	Gr𝑚,𝑞Re^2𝑚	Gr𝑚,Δ𝑇Re^2𝑚	𝑓/𝑓𝐵	Nu𝑚/Nu∞(=𝑗/𝑗∞)	1×10^4
60^° NP	3000 (2500)	1	0	11595	1.03	0	0	0	12.79	2.40
			×	12343	0.97	4.8 2×10^4 10^8	3.15	0.04	11.47	2.37
			×	12966	0.93	9.6 4×10^4 10^8	5.71	0.07	10.52	2.35
				14189	0.85				8.98	2.29
			×	(14100)	(0.85)	1.9 1×10^5 10^9	9.54	0.11	(9.08)	(2.38)
				15040^*	0.80^*				8.11^*	2.23^*
			×	13199	0.76	4.0 1×10^4 10^9	22.96	0.26	7.08	2.38
	4000	2	0	9985	3.21	0	0	0	29.55	2.57
			×	10124	3.16	6.4 2×10^4 10^8	6.24	0.08	28.84	2.59
			1.3×10^9	10213	3.13	5×10^3	12.27	0.16	28.39	2.60
				(10350)	(3.09)				(27.74)	(2.62)
	1000 [23]	1	0	3447	1.16	0	0	0	11.87	2.67
				(3501)	(1.14)				(11.56)	(2.70)
			×	3900	1.03	8.0 1×10^4 10^7	5.26	0.14	9.57	2.66
			×	4237	0.94	1.6 2×10^4 10^8	8.91	0.22	8.28	2.69
			×	4779	0.84	3.2 1×10^4 10^8	14.01	0.32	6.70	2.68
				(4736)	(0.84)				(6.81)	(2.72)
Smooth [22]	3500	2	0	9416	2.97	0	0	0	25.07	2.53
			×	9545	2.93	5.6 3×10^4 10^8	6.15	0.09	24.47	2.48
			×	9851	2.84	1.7 × 10^9	17.52	0.24	23.18	2.55