Effect of droplet characteristics on heat transfer of mist/air cooling in a pin-finned channel

Figures & data

Figure 1. Schematic diagram of computational model.

Figure 2. Geometrical structure of different pin-fins.

Table 1. Boundary conditions.

Inlet parameters	T0 (K)	Re	Va (m·s^−1)	Tu
	373.15	15,000–50,000	5.87–19.33	5%
Outlet parameters	Pout (atm)
	1.0
Wall parameters	Tw (K)
	423.15
Mist parameters	MFR	dm (μm)	Tm (K)	Vm
	0.01	5, 10, 15, 20	300	Va
	0.01	10	300, 330, 360	Va
	0.01	10	300	0.1Va, 0.5Va, 1.0Va

Figure 3. Comparison of row-averaged Nu along the streamwise direction for (a) three grids and (b) fine grid solution with discretization error bars.

Figure 4. Comparison of the CFD predicted results by four turbulence models with measurements [12].

Figure 5. Local Nusselt number contour distributions for different pin-fin structures at Re = 40,000.

Figure 6. Variation of averaged Nusselt number with Reynolds number for different pin-fin structures with different coolants.

Figure 7. Variation of row-averaged Nusselt number for different coolants at Re = 20,000 and 40,000.

Figure 8. The droplet diameter variation with Reynolds number for mist/air cooling.

Figure 9. Variation of friction factors with Reynolds number for different pin-fin structures with different coolants.

Figure 10. The droplet diameter variation with different initial mist temperature.

Figure 11. Variation of averaged Nusselt number with different initial mist temperature for different pin-fin structures.

Figure 12. Variation of thermal performance factors with different initial mist temperature for different pin-fin structures.

Figure 13. The droplet diameter variation with different initial mist diameter.

Figure 14. Variation of averaged Nusselt number with different initial mist diameter for different pin-fin structures.

Figure 15. Variation of thermal performance factors with different initial mist diameter for different pin-fin structures.

Figure 16. The droplet diameter variation for different initial mist velocity.

Figure 17. Variation of averaged Nusselt number for different initial mist temperature for different pin-fin structures.

Figure 18. Variation of thermal performance factors with different initial mist velocity for different pin-fin structures.

S. C. Siw, M. K. Chyu, and M. A. Alvin, Effects of pin detached space on heat transfer and pin-fin arrays, ASME Paper, No. GT2010-23227, 2010.

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