Beyond direction-agnostic assumptions: Direction-integrated models for asymmetric falling film thickness and heat transfer under multidirectional vapor shear

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dc.contributor.authorZhao, Chuang-Yao
dc.contributor.authorLi, Qiong-Tao
dc.contributor.authorJia, Chen-Yi
dc.contributor.authorZhang, Fang-Fang
dc.contributor.authorQi, Di
dc.contributor.authorYildizhan, Hasan
dc.contributor.authorJiang, Jun-Min
dc.date.accessioned2026-02-27T07:33:28Z
dc.date.available2026-02-27T07:33:28Z
dc.date.issued2026
dc.description.abstractThe orientation of vapor streams in falling film evaporators (FFEs), determined by tube bundle configurations, plays a critical role in shaping liquid film hydrodynamics and heat transfer performance. Conventional models adopt direction-agnostic assumptions, averaging vapor shear effects and introducing significant errors in localized predictions. This study proposes a direction-integrated framework that explicitly incorporates vapor orientation as a governing parameter, capturing the asymmetric effects of multidirectional vapor shear on film thickness and heat transfer. The proposed correlations are validated against a broad range of benchmark data, achieving 80 % of film thickness predictions within +25 % error, over 86 % of local heat transfer coefficients within +20 %, and all average values within +5 %. Comparative analysis shows strong agreement with experimental and numerical results under gravity-driven, laminar conditions. Vapor directionality is shown to significantly alter heat transfer along the tube periphery, especially between upper and lower regions. These findings enhance the predictive reliability of FFE modelling and provide valuable guidance for optimizing evaporator design and improving energy efficiency in industrial applications.
dc.description.sponsorshipProvince [2025JC-YBMS-439]; National Natural Science Foundation of China [51976144]
dc.description.sponsorshipThis work was supported by Natural Science Foundation of Shaanxi Province (2025JC-YBMS-439) , the National Natural Science Foundation of China (51976144) . The authors also gratefully acknowledge the support of XAUAT Branch of Computing Center in Xi'an, the International Joint Research Center for Building Service Science and the Underground Space Environment, Shaanxi (China) .
dc.identifier.doi10.1016/j.ijmultiphaseflow.2025.105439
dc.identifier.issn0301-9322
dc.identifier.issn1879-3533
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijmultiphaseflow.2025.105439
dc.identifier.urihttps://hdl.handle.net/20.500.14669/4591
dc.identifier.volume194
dc.identifier.wosWOS:001568652700001
dc.indekslendigikaynakWeb of Science
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofInternational Journal of Multiphase Flow
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20260302
dc.subjectLiquid film
dc.subjectGas stream
dc.subjectFilm thickness
dc.subjectHeat transfer coefficient
dc.subjectCorrelations
dc.subjectEvaporative cooling
dc.titleBeyond direction-agnostic assumptions: Direction-integrated models for asymmetric falling film thickness and heat transfer under multidirectional vapor shear
dc.typeArticle

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