Study of the Characteristics of Heat Rransmission in Spiral Pipes of Different Degrees
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Abstract
Presently, there is an escalating research trend focused on renewable energy exploration and energy efficiency optimization. Rapid advancements in industrial technologies have concurrently led to a substantial increase in global energy consumption. Consequently, enhancing the performance of heat exchangers represents a viable strategy to mitigate energy consumption while simultaneously minimizing the physical size, weight, and installation footprint of the equipment. This study investigates the heat transfer characteristics and fluid flow behavior of hot water within twisted tubes configured at distinct angles. Experiments were conducted under a constant wall heat flux condition. The specific thermal transport characteristics were evaluated by adjusting the twist angles to 30, 60, and 90 degrees, utilizing volumetric flow rates of 20, 40, and 60 liters per minute at a constant temperature of 50 degrees Celsius. The experimental results indicate that turbulent flow occurs within the tubes when the Reynolds number exceeds 4,000 (Re > 4,000). Comparatively, the 30-degree twisted tube exhibited the highest heat transfer coefficient among all tested configurations, including the conventional smooth tube. Specifically, at flow rates of 20, 40, and 60 liters per minute the 30-degree twisted tube enhanced the convective heat transfer coefficient by 18.89%, 18.30%, and 18.83%, respectively, relative to the smooth tube.
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ลิขสิทธ์ ของมหาวิทยาลัยเทคโนโลยีราชมงคลพระนครReferences
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