用级联晶格玻尔兹曼方法对垂直加热器振动增强池沸腾传热和气泡动力学进行了数值研究

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-10 DOI:10.1016/j.tsep.2025.104076

Sonali Priyadarshini Das, Anandaroop Bhattacharya

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引用次数: 0

摘要

采用级联晶格玻尔兹曼方法，对垂直振动对池沸腾传热和气泡动力学的影响进行了数值研究。频率(f)变化范围为0-1000 Hz，幅度(a)变化范围为0-3 mm。垂直振动增强了池沸腾换热性能，同时也增强了气泡动力学。气泡平均偏离直径（Davg）在恒幅下随频率(f)的增加而增加，在恒频下随振幅的增加而增加。气泡出发频率（fb）和气泡成核总数（Nn）在恒定频率下随频率的增加而增加，在恒定频率下随振幅的增加而减少。无量纲平均气泡偏离直径（D*）、气泡生长频率（Sr*）、气泡偏离频率（Srt*）和气泡成核总数与以Strouhal数（Sr）表示的无量纲频率相关。D*减少54.7%，Sr*增加123.2%，Srt*增加41.13%，Nn增加50%。时空平均热流密度（q″）和换热系数增强比（ER）随频率和振幅的增加而增大。当f = 500 Hz, A = 2 mm时，临界热通量（CHF）最大增强32.24%。在f = 1000 Hz时，发现a = 2 mm时最大增强20.18%，ER增加97.42%。总体而言，发现最佳频率范围为100 - 1000 Hz，在此范围内可以显著增强池沸腾。在这个范围内，振动还被发现有助于延迟膜沸腾，同时获得高CHF和传热系数。基于数值结果，提出了f≤100hz和100hz <； f≤1000hz两个不同频率范围内普朗特数、雷诺数和振动雷诺数（无量纲振动强度）的努塞尔数相关关系。

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A numerical study on the enhancement of pool boiling heat transfer and bubble dynamics through vertical heater vibration using cascaded lattice boltzmann method

A numerical investigation of the effect of vertical vibration on the pool boiling heat transfer and bubble dynamics is conducted using the Cascaded Lattice Boltzmann method. The frequency (f) was varied from 0-1000 Hz and amplitude (a) from 0-3 mm. Vertical vibration enhanced the pool boiling heat transfer performance along with the bubble dynamics. The average bubble departure diameter (D_avg) increases with an increase in frequency (f) at constant amplitude and increases with an increase in amplitude at constant frequency. The bubble departure frequency (f_b) and the total number of bubble nucleation (N_n) increase with an increase in frequency at a constant amplitude and decrease with an increase in amplitude at a constant frequency. The dimensionless average bubble departure diameter (D*), frequency of bubble growth (Sr*), frequency of bubble departure (Srt*) and total number of bubble nucleation were correlated with the dimensionless frequency expressed as Strouhal number (Sr). A maximum of 54.7 % decrement in D*, 123.2 % increase in

Sr

*, 41.13 % increment in Srt*, and 50 % increment in Nn were observed. The space–time-average heat flux (q″) and the enhancement ratio (ER) for the heat transfer coefficient increased with an increase in frequency and amplitude. A maximum enhancement of 32.24 % in critical heat flux (CHF) was obtained for f = 500 Hz and a = 2 mm. At f = 1000 Hz, the maximum enhancement was found to be 20.18 % at a = 2 mm with an associated increase in ER of 97.42 %. Overall, the optimum frequency range was found to be 100–––1000 Hz where significant enhancement in pool boiling was obtained. In this range, the vibrations were also found to assist in delaying film boiling while achieving high CHF and heat transfer coefficients. Based on the numerical results, a Nusselt number correlation has been proposed in terms of the Prandtl number, Reynolds number, and vibrational Reynolds number (non-dimensional intensity of vibration) for two different frequency ranges of f ≤ 100 Hz and 100 Hz < f ≤ 1000 Hz.

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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