由於散熱鰭片的構造簡單且製造容易，因此被大量使用於發熱裝置散熱之用，特別是在電子元件之冷卻方面。
當發熱元件與散熱鰭片的接觸面積不相同時，熱量由發熱元件產生透過散熱鰭片發散至外界時，因為熱流通過不同的截面積，此時散熱鰭片的熱阻除了其本身的熱阻之外，還會另外多增加一項熱阻值，我們稱它為擴散熱阻（spreading resistance）。由於多了這項熱阻，散熱鰭片的總熱阻會高於當初設計者所預估的熱阻值大小，因此影響了散熱鰭片的散熱效能。

在本研究中，改變發熱元件與散熱鰭片接觸面積的大小以及散熱鰭片底部基座的厚度，透過實驗藉由改變這些參數對於散熱鰭片的散熱效能是否有所影響。本研究發現在散熱鰭片的熱阻並非隨著厚度的增加而增加，而是有一個最佳厚度，能使散熱鰭片得到較好的散熱能力。因此在設計散熱鰭片時，除了要考慮鰭片的高度、長度以及密度等參數時，尚需注意到底部基座厚度也會影響散熱鰭片的散熱能力。

經由實驗比較之結果，在沒有擴散熱阻的影響下，散熱鰭片的熱阻值會比在有擴散熱阻影響下的熱阻值還要低。而不論是否有無擴散熱阻的影響下，底部基座厚度為4mm的散熱鰭片擁有較佳的散熱能力。

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