Numerical investigation of wave dynamics in laminar falling films: influence of Kapitza number and inclination angle

IF 4 3区工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

International Journal of Numerical Methods for Heat & Fluid Flow Pub Date : 2025-01-23 DOI:10.1108/hff-08-2024-0640

Yuanxiang Chen, Jian Zheng, Yue Liu, Asensio Oliva Llena, Jesus Castro Gonzalez

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引用次数: 0

Abstract

Purpose

This study aims to optimize the design of falling film heat exchangers by providing a deeper understanding of wave characteristics and capillary flow in laminar inclined falling films at low Reynolds numbers. The focus is on the effects of different Kapitza numbers, influenced by fluid properties and inclination, on the interfacial wave behavior.

Design/methodology/approach

A numerical investigation was conducted using the volume of fluid method within OpenFOAM’s interFoam solver. This study examined the effects of Kapitza number, inclination angle and inlet disturbances on wave formation and flow dynamics, analyzing how these factors influence interfacial wave amplitude, wavelength and flow in the capillary region.

Findings

The results revealed that higher Kapitza numbers lead to the formation of stronger capillary waves. Flow separation was observed in the capillary wave region for materials with high Kapitza numbers. An improved Nosoko correlation model was developed, incorporating the inclination angle to more accurately predict the relationship between wave peaks and wavelengths in inclined cases.

Originality/value

This research investigates the impact of low Kapitza number on inclined falling film flow, and a correlation model was derived that provides a broader range for evaluating wave behavior in inclined conditions, offering extended references for the design of falling film heat exchangers.

查看原文本刊更多论文

层流落膜中波动动力学的数值研究：Kapitza数和倾角的影响

目的通过深入了解低雷诺数层流倾斜降膜中的波特性和毛细流动，优化降膜换热器的设计。重点研究了受流体性质和倾角影响的不同Kapitza数对界面波行为的影响。设计/方法/方法采用OpenFOAM的interFoam求解器中的流体体积法进行了数值研究。本研究考察了Kapitza数、倾角和进口扰动对波浪形成和流动动力学的影响，分析了这些因素对毛细区界面波振幅、波长和流动的影响。结果表明，Kapitza数越高，毛细血管波的形成越强。高Kapitza数的物料在毛细管波区出现了流动分离现象。提出了一种改进的Nosoko相关模型，该模型考虑了倾角，可以更准确地预测倾斜情况下波峰与波长的关系。独创性/价值本研究探讨了低Kapitza数对倾斜降膜流动的影响，并推导了一个相关模型，为评估倾斜条件下的波动行为提供了更广泛的范围，为降膜换热器的设计提供了更广泛的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Numerical Methods for Heat & Fluid Flow 工程技术-力学

CiteScore

9.50

自引率

11.90%

发文量

100

审稿时长

6-12 weeks

期刊介绍： The main objective of this international journal is to provide applied mathematicians, engineers and scientists engaged in computer-aided design and research in computational heat transfer and fluid dynamics, whether in academic institutions of industry, with timely and accessible information on the development, refinement and application of computer-based numerical techniques for solving problems in heat and fluid flow. - See more at: http://emeraldgrouppublishing.com/products/journals/journals.htm?id=hff#sthash.Kf80GRt8.dpuf