Abstract
In the present study, the effect of conical obstacles on heat transfer and flow characteristics in a circular tube was investigated. In most previous studies, stationary obstacles were used to stimulate the flow and to investigate heat transfer and pressure drop. In the present paper, in addition to investigating the effect of a stationary obstacle, the effect of using moving obstacles was studied, both empirically and numerically, as a new topic on heat transfer and pressure drop in turbulent flow inside the pipe. In this study, the rotating speed of the obstacle ranged from 50 to 100 rpm, and the ranged from 4000 to 24,000. The results revealed that the heat transfer and friction factor changed by 2.2–3.95 and 17.2–22.2 times relative to the smooth tube, respectively. Also, the thermal performance coefficient was 120% more than the stationary obstacles. According to the findings of the current study, studying the effect of obstacle rotation on thermohydraulic characteristics is an innovative and useful topic. Altogether, besides its easy construction, compared to previous reports, the conical obstacle is a suitable obstacle that can be employed to improve thermal performance.
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