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The surface tension for ethanol at the saturation temperature is 1.02 × 10-2 N m-1, giving a Weber number of 2.77 × 10-4. With these values plus the liquid viscosity of 0.173 mPa-s and the vapor viscosity of 0.013 mPa-s the pressure drop modifier for the representative point is 2.71. Therefore, from equation (5.83) the two-phase ethanol pressure drop is 9.72 Pa m-1 for the given slice of the two-phase portion of the evaporator. The length of each two-phase slice for the evaporator is found using the area equations given in (5.74) through (5.78). From the results described for the representative two-phase slice, the required ethanol channel surface area is 0.311 m2 and the required exhaust channel surface area is 0.375 m2, requiring an evaporator slice length of 0.025 m. The overall length of the evaporator is 0.164 m and is found by summing the lengths of the single-phase section and the 20 two-phase sections. Figure 5-15 shows the cumulative evaporator length plotted against the cumulative heat duty, starting with the single-phase liquid and proceeding to 100% ethanol vapor at the outlet (left to right). This figure demonstrates that over half of the evaporator length is used to heat the liquid Figure 5-15. Cumulative evaporator length vs. cumulative heat duty starting with liquid inlet and ending with 100% ethanol vapor. 112PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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