Category: FALLING FILM

The purpose of this webinar is to discuss industry experience with vertical tubeside falling film evaporators, including specified applications and design principles for configuration. In this webinar, we identify potential design problems in keeping tube walls wet and discuss HTRI’s current methods in addressing these concerns within Xist....
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With p-xylene as the test fluid, HTRI collected data for both cocurrent and countercurrent flow in a vertical tubeside falling film evaporator (FFE) test section. Preliminary results for a single-component fluid indicate that HTRI methods predict heat transfer coefficients within ±35%; that pressure drop trends with the flow regime parameter; and...
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HTRI Report BT-10 documents HTRI sponsored research on falling film evaporation of glycol/water solutions at Lehigh University during the period 1986 - 1988. In that document it was reported that evaporating films composed of mixtures of ethylene glycol and water break down at much lower heat fluxes for a given flow...
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HTRI Report BT-10 documents HTRI sponsored research on falling film evaporation of glycol/water solutions at Lehigh University during the period 1986 - 1988. In that report the required mass transfer correction to heat transfer was determined by a mass diffusion method applying only to binary mixtures. This Research brief makes a...
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HTRI collected data for falling film evaporation in a vertical tube using five test fluids. This report discusses available pressure drop methods and correlations for intube falling film evaporators and investigates correlations for liquid film thickness and void fraction. The report also documents an improved pressure drop method based on the...
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HTRI collected falling film evaporation data for two pure components and three mixtures in a vertical tube. Current falling film methods in Xist® 8.2 underpredict most of the measured heat transfer coefficients. Based on the latest data, we have improved our heat transfer methods, including a vapor-shear enhancement factor, a new mixture correction factor...
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After summarizing the results from HTRI Research over the past year, this webinar provides insights into how these results improve our technology and its use by HTRI members. Topics include prediction of hot air recirculation for air coolers, development of new non-Newtonian heat transfer correlations, modification of tubeside falling film heat...
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This report provides an overview of several mechanisms for the breakdown of falling film. Available literature and HTRI data enable confirmation of the minimum wetting flow rate calculation used in Xist 8.2 and the development of two correlations for determining Reynolds numbers for the Marangoni breakdown, one for the subcooled zone...
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