Abstract

An apparatus is described for studying unsteady heat transfer in various liquid media by the method of controlled heating of a thin wire probe. The main link of the setup is a high-speed electronic regulator that controls the power dissipated by the probe depending on the control voltage at the regulator input. The main parameters of the apparatus are: the probe is a 1-cm-long 20-μm platinum wire and the controller response time is ≈1–2 μs, the accuracy of maintaining the power value is 0.05%, the heating time is 1–500 ms, and the heat flux density from the probe surface is up to 20 MW/m². A measurement technique is presented and an example of using a setup for studying the spinodal decomposition of an aqueous solution of polypropylene glycol (PPG-425), which has a lower critical dissolution temperature, is provided.

中文翻译：

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一种研究液体介质中非平稳热交换的装置

摘要

描述了一种通过控制加热细线探针的方法研究各种液体介质中的非稳态传热的装置。设置的主要环节是一个高速电子调节器，它根据调节器输入端的控制电压控制探头消耗的功率。仪器主要参数为：探头为1cm长20μm铂丝，控制器响应时间≈1-2μs，功率值保持精度为0.05%，加热时间为1 –500 ms，探头表面的热流密度高达 20 MW/m ². 介绍了一种测量技术，并提供了一个使用设置来研究聚丙二醇 (PPG-425) 水溶液的旋节线分解的示例，该溶液具有较低的临界溶解温度。