Tag: FALLING FILM

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Improving models of falling film evaporators

November 04, 2024

LiDong Huang, Principal Engineer, Experimental Research Tubeside falling film evaporators (FFEs) have many advantages compared to other types of vaporizers and reboilers. Downflow evaporation reduces liquid holdup and residence time, which is a great advantage in handling heat sensitive liquids [1, 2] such as sugar/glucose solutions and milk products. Heat transfer...
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• VAPOR
• XIST
• HEAT TRANSFER
• FALLING FILM

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BT-43 Liquid Film Breakdown in Tubeside Falling Film Evaporators

May 19, 2021

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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• XIST
• FALLING FILM
• BOILING

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Research Update: 2020 - Year in HTRI Research

February 09, 2021

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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• RESEARCH
• NON-NEWTONIAN FLOW
• FALLING FILM
• AIR COOLED

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BT-42 Improved heat transfer methods for tubeside falling film evaporators

November 17, 2020

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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• HEAT TRANSFER
• FALLING FILM

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BT-41 Pressure drop method for tubeside falling film evaporators

October 19, 2020

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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• PRESSURE DROP
• FALLING FILM

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How Marangoni stress affects falling films

October 09, 2020

LiDong Huang, Principal Engineer, Experimental Research   Anyone who drinks wine may notice that droplets (or tears) of wine form on the inside wall of a wine glass. But what causes this phenomenon? The short answer: it is all about Marangoni stress and evaporation, both of which are linked to falling...
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• FALLING FILM

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BT-40-TR Vertical Tubeside Falling Film Evaporation of p-Xylene

February 06, 2019

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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• FALLING FILM

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Is My Design OK? Lessons Learned: Falling Film Evaporators

February 01, 2017

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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• DESIGN
• FALLING FILM
• XIST

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BT-11 Film Breakdown in Falling Film Evaporation of Ethylene Glycol/Water and Ethylene Glycol/Water/I-Propanol Solutions, Preliminary Evaluation

January 16, 2017

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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• FALLING FILM

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RB3-8 Falling Film Evaporation of Ethylene Glycol-Water Solutions, Prediction by HTRI Boiling Range Method

January 16, 2017

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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• FALLING FILM

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