نوع مقاله : مقاله پژوهشی
نویسنده
گروه مهندسی مکانیک، واحد شهر مجلسی، دانشگاه آزاد اسلامی، اصفهان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
The porous materials in hot water dryers are used in industry because they increase heat transfer. In these cases, the thermal performance of the heat channels is greatly influenced by the arrangement of the porous material inside the duct. Therefore, the aim of this study, which was performed by simulation method by Ansys Fluent 16 software, is to improve heat transfer in hot water dryers using new geometries of porous materials. For this purpose, the effect of 5 different types of geometry for porous material (with equal volumes) at 5 different dimensional heights of metal foam (1, 0.8, 0.6, 0.4, and 0.2) and the effect of two different pore diameters (0.1 and 0.05 cm) were evaluated on the hydrodynamic and heat transfer indices including average Nu number and performance evaluation criteria (PEC). The porous material was considered aluminum alloy with a thermal conductivity of 40 W / m2K and a porosity of 0.95 throws a thermal sink. The results showed that using porous materials in the heat channel increased the Nu number and heat transfer. Also, increasing the pore diameter in porous materials increased the Nu number. The highest PEC number was related to the case where the pore diameter and the height of the porous material are equal to 0.1 and 0.2 cm, respectively.
کلیدواژهها [English]
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