Advanced International Journal for Research

E-ISSN: 3048-7641   •   Impact Factor: 9.11

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Volume 7 Issue 1
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A Review on Evaporative Cooling Characteristics of Falling Water Films over Horizontal Tubes

Author(s) Prof. BHAIRAVNATH RATILAL JADHAV, Prof. PRADIP VASANTRAO DESHMUKH, Prof. RAHUL SHIVRAM NAGMODE
Country India
Abstract Falling liquid film systems operating over horizontal tubes are extensively employed in evaporative cooling and absorption-based thermal systems due to their superior heat and mass transfer performance. This paper presents a critical review of experimental and numerical investigations related to the evaporative cooling of a falling water film on horizontal tube surfaces. Emphasis is placed on understanding the hydrodynamic behavior, flow regime transitions, and heat transfer characteristics of liquid films flowing over multiple horizontal cylinders arranged perpendicular to the flow direction. The influence of governing parameters such as Reynolds number, tube diameter, tube spacing, and surface geometry on film distribution, droplet formation, and evaporation characteristics is analyzed. In addition, studies related to water–lithium bromide (LiBr) falling film absorbers employing small-diameter tubes are reviewed. The role of enhanced tube surfaces, including fluted geometries, in improving film stability and thermal performance is also discussed. The review highlights the critical parameters governing absorber efficiency and provides direction for future research in high-performance evaporative cooling systems.
Keywords Keywords: Falling film, Evaporative cooling, Horizontal tubes, Heat and mass transfer, Absorber, Flow regimes
Field Engineering
Published In Volume 7, Issue 1, January-February 2026
Published On 2026-01-29
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E-ISSN 3048-7641
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