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heat pipes have a multitude of applications in the thermal management of electronics. the thermal resistance of a heat pipe strongly depends, among other parameters, on so-called l-ratio, which is the ratio between the evaporator length and condenser length.
the optimal l-ratio is defined as being the value for which the heat pipe thermal resistance is minimal, for a certain heat pipe assembly configuration. finding the optimal l-ratio offers a valuable tool for thermal practitioners to most effectively deploy the heat pipe in their application. this article reviews an analytical approach for finding this optimum l-ratio [1].
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