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m-1 K-1, yielding a convection heat transfer coefficient for vapor ethanol of 37.1 W m-2 K-1. From equation (5.81), the previous result plus the average quality of 0.025 yields a two-phase heat transfer coefficient of 141 W m-2 K-1. Note that this ethanol heat transfer coefficient is lower than in the singe-phase portion of the evaporator. However, Figure 5-14 demonstrate that the heat transfer coefficient increases to over 2 kW m-2 K-1 as the cumulative heat duty rises near 3 kW, but then reduces again as the quality approaches 1. The two-phase ethanol pressure drop was estimated using a correlation given by Friedel [58] for horizontal flow. Friedel proposed a pressure drop multiplier that is similar to the multiplier used in equation (5.60). However, Friedel’s multiplier modifies the pressure drop found if the entire two-phase flow were liquid opposed to the pressure drop for the liquid fraction of the total flow: dP Φ2 dP (5.83) lo dL tp dL lo Figure 5-14. Plot of ethanol heat transfer coefficient in the evaporator vs. the cumulative heat duty. The plot starts with the single-phase section (first point) and proceeds through the two-phase section as the cumulative heat duty increases. 110PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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