Experimental investigation of solar air heater duct with discrete V-rib integrated with staggered elements

Figures & data

Figure 1. Schematic diagram of present roughness geometry

Figure 2. Pictorial view of roughness geometry

Table 1. Range of parameters of current investigation

S. No.	Roughness parameters	Range
1	W	200 mm
2.	H	25 mm
3.	p/e	12
4.	e/Dh	0.045
5.	α	60°
6.	g/e	1
7.	r/e	2, 3.5, 4.5 and 5.5
8.	p’/p	0.65
9.	Re	3000–12,000
10.	Ng	6

Figure 3. (a) Sketch and actual photo of test setup (b) Position of thermocouples over absorber surface (c) Variation of absorber surface temperature

Figure 4. Variation of experimental and theoretical value of Nu

Figure 5. Variation of experimental and theoretical value of f

Figure 6. Flow pattern for discrete V-rib integrated with staggered elements

Figure 7. Stanton number ratio vs Re

Figure 8. Friction factor ratio vs Re

Figure 9. Thermal efficiency (η_th) vs Re

Figure 10. Plot of Nu vs Re

Figure 11. Plot of Nu/Re^0.9248 vs r/e

Figure 12. Plot of f vs Re

Figure 13. Plot of f/Re^−0.2355 vs r/e

Figure 14. Plot of Nu_predicted vs Nu_{experimental.}

Figure 15. Plot of f_predicted vs f_{experimental.}