Numerical and Experimental Study of Evaporation of Liquid Effluent Flowing on an Inclined Plate

Research Area: Volume 7,Issue 1, Jan. 2018 Year: 2018
Type of Publication: Article Keywords: Evaporation, Effluent, Balance, Heat Flux, Mass Flow
Journal: IJEIR Volume: 7
Number: 1 Pages: 22-30
Month: January
ISSN: 2277-5668
This work deals with the recovery of liquid effluent by thermal evaporation. The effluent is a digestate of pig manure which is subjected to anaerobic digestion and phase separation by centrifugation. Its dry matter is about 2.3%. The goal is to minimize its water content and to use it as a fertilizer on agricultural soils. The evaporator consists on a stainless steel plate inclined by 30°. The plate is exposed to solar simulator radiations which heat flux is about 452W/m² in average. Once plate temperature is stabilized, the liquid is injected from the top of the plate. The cartography of the plate temperature is obtained by two methods; the first is measured and the second is made by calculating from thermal balances. Evaporation tests were performed. The device is, on one hand, covered with a glass, and removed, on the other hand. A comparison between measured evaporated mass flow and calculated from mass balances is determined in laminar regime. It depends on many parameters, especially on heat flux, air, plate and liquid temperature.

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