本文以CFD軟體結合傳統逆向方法分析雙管板鰭管式熱交換器於矩形流道的熱傳性質，搭配實驗溫度數據使用最小平分法驗證其準確度，並考量熱輻射之影響，探討入口風速、鰭片間距以及加熱管間距之影響。本文主要使用CFD軟體求得熱傳參數、速度流場圖以及溫度分布圖，根據實驗數據與逆算結果對紊流模式選用以及網格劃分，在自然對流中Zero-equation模式之結果較為準確，混合對流之模型則會透過風速改變進行變更，在低速V_a=1 m/s選用RNG k-ε 紊流模式，而在高速V_a=5 m/s時Enhanced Realizable k-ε 比RNG k-ε 模式更符合逆算結果；在本文擬定研究參數範圍內，透過實驗量測數據、等溫熱源下之模擬數據以及受到熱輻射影響下未知熱源之模擬數據，分別比對各案例之熱傳係數變化，並觀察各項參數之變化趨勢。

This study employs CFD software combined with a traditional inverse method to analyze the heat transfer characteristics of a multi-tube plate fin heat exchanger within a rectangular flow channel. Experimental temperature data are used alongside the least squares method to validate the accuracy of the simulations, with particular consideration given to the influence of thermal radiation. The effects of inlet air velocity, fin spacing, and the distance between heated tubes are investigated.
CFD simulations are utilized to obtain heat transfer parameters, velocity fields, and temperature distributions. Based on comparisons with experimental data and inverse calculations, turbulence models and mesh configurations are evaluated. Under natural convection conditions, the Zero-equation model demonstrates higher accuracy. For mixed convection, the selection of turbulence models varies with airflow velocity: the RNG k-ε model performs better at low speeds, while the Enhanced Realizable k-ε model shows improved agreement with inverse results at higher speeds.
Within the defined parameter range of this study, heat transfer coefficients from experimental measurements, simulations excluding thermal radiation, and simulations including radiation effects are compared across different cases. The trends associated with various parameters are also examined.

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