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The orientation effects on pool boiling with 30 K of subcooling for the HTCMC were examined in order to investigate the combined effects of orientation and subcooling.
Based on the experimental results of CHF values for orientation at 30 K of subcooling for the HTCMC surface, the orientation effect can be classified into three regions: upward to vertical (0-90[degrees]) where the CHF maintains close values; vertical to inclined downward facing (90-170[degrees]) where the CHF linearly decreases with the orientation angle; and further downward facing (170-180[degrees]) where the CHF abruptly decreases just as Jun et al.
The results showed that the nucleate boiling heat transfer did not change much with the degree of subcooling for both the HTCMC and the plain surface.
Caption: Figure 4: SEM of HTCMC sintered copper particles.
Caption: Figure 5: Boiling curves of HTCMC and a plain Cu surface at subcoolings.
Caption: Figure 6: Nucleate boiling comparison of Plain Cu and HTCMC with different subcooled temperatures ([DELTA][T.sub.sub]) of 0 K, 10 K, 20 K, and 30 K at a heat flux of 1,000 kW/[m.sup.2].
Caption: Figure 7: Nucleate boiling comparison of Plain Cu and HTCMC with different subcooled temperatures ([DELTA][T.sub.sub]) of 0 K, 10 K, 20 K, and 30 K at the CHF.
Caption: Figure 8: CHF comparison of HTCMC and plain surface with subcooling.
Caption: Figure 9: Normalized CHF comparison of HTCMC and plain surface with subcooling.
Caption: Figure 10: Boiling curves of HTCMC with various orientation angles at 30 K subcooling.
Caption: Figure 11: CHF comparison of HTCMC with orientation between saturation and 30 K subcooling; A: upward to vertical (0-90[degrees]), and B: vertical to downward facing (90-170[degrees]), and C: downward facing to complete downward (170-180[degrees]).
Result/Model [C.sub.sub] Plain Cu (Present) 0.0535 HTCMC (Present) 0.0296 Kutateladze [1] 0.0446 Ivey and Morris [3] 0.0482 Zuber [6] 0.0522