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Positive sign (+) holds for parallel flow while negative sign (-) holds for counter flow. Ai's are above for positive and below A for negative values. Generally, for parallel flow > 0, b > 0 for counter flow ^ < 0, b < 0 (28) The equations listed so far were used only to demonstrate the procedures to evaluate the state changes of the flow resulting from combinedheatandmasstransfer. Foraspecifiedheatloadofacon denser and for specified flow rates and flow pattern within the chan nels transfer coefficients must be evaluated. 5. BasicHeatTransferEquations The hydraulic diameter of the elemental channel shown in Fig. h and of geometry given in Fig. 5, is AMo m surface area on the air-side of one module. The Reynolds number of the air flow is defined as GA ' DhA PA ‘ 3600 (30) 1+ • AAMo SL Am (29) where A.,, is the minimum cross-section area and A is the total DhA where is the mass flux through the minimum cross-section area and HA is the dynamic viscosity of the moist air. The heat transfer coefficient h^ is evaluated from experimental data given in heat transfer literature [2,3,**] in terms of Colburn j-factor. Theexperimentalj-factorcurvewasreplacedmathematically as and 0.17199 Re -0.U0307 (31) (32) C-21PDF Image | Development of the Zinc-Chlorine Battery for Utility
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