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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >BIFURCATION ANALYSIS FOR HORIZONTAL LONGITUDINAL FINS UNDER MULTI-BOILING CONDITIONS
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BIFURCATION ANALYSIS FOR HORIZONTAL LONGITUDINAL FINS UNDER MULTI-BOILING CONDITIONS

机译：多重沸腾条件下水平纵向鳍的分叉分析

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摘要

A numerical bifurcation analysis is carried out in order to determine the solution structure of a fin subject to multi-boiling heat transfer mode. The thermal analysis can no longer performed independently of the working fluid since the heat transfer coefficient is temperature dependent and includes the nucleate, the transition and the film boiling regime where the boiling curve is obtained experimentally for a specific fluid. The heat transfer process is modeled using one-dimensional heat conduction with or without heat transfer from the fin tip. Furthermore, five fin profiles are considered: the constant thickness, the trapezoidal, the triangular, the convex parabolic and the parabolic. The multiplicity structure is obtained in order to determine the different types of bifurcation diagrams, which describe the dependence of a state variable of the system (for instance the fin temperature or the heat dissipation) on a design (CCP) or operation parameter (base TD). Specifically the effects of the base TD, of CCP and of the Biot number are analyzed and presented in several diagrams since it is important to know the behavioral features of the heat rejection mechanism such as the number of the possible steady states and the influence of a change in one or more operating variables to these states. Stability analysis is carried out using the "resonance integral" technique and the Sturm-liouville eigensystem analysis.
机译：为了确定翅片的多重沸腾传热模式的溶液结构，进行了数值分叉分析。由于传热系数是温度相关的，并且包括成核，过渡和薄膜沸腾状态，因此不能再独立于工作流体进行热分析，其中通过实验获得特定流体的沸腾曲线。传热过程是使用一维热传导建模的，有或没有散热片尖端的传热。此外，考虑了五个翅片轮廓：恒定厚度，梯形，三角形，凸抛物线形和抛物线形。为了确定分叉图的不同类型，获得了多重结构，分叉图描述了系统状态变量（例如翅片温度或散热）对设计（CCP）或操作参数（基本TD）的依赖性）。由于要了解排热机制的行为特征（例如可能的稳态数和碳原子的影响）非常重要，因此特别要分析并显示基本TD，CCP和Biot数的影响。将一个或多个操作变量更改为这些状态。使用“共振积分”技术和Sturm-liouville本征系统分析进行稳定性分析。

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