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Abstract
The research paper tends to review the effectiveness of helical coil in heat exchangers (HCHE). Heat exchanger is a device used in transferring thermal energy between two or more fluids or solid interfaces and a fluid, in solid particulates and a fluid at different temperatures and thermal contact. The author has concisely discussed the helical coil in heat exchanger at different shapes and conditions and compared the HCHE with straight tubes heat exchangers, and the factors affecting the performance and effectiveness of the helical coil heat exchanger such as the curvature ratio, and other heat exchangers. The author demonstrated that the HCHE provided more excellent heat transfer performance and effectiveness than straight tubes and other heat exchangers because of secondary flow development inside the helical tube, and heat transfer coefficient increased with an increase in the curvature ratio of HCHE for the same flow rates. The secondary flow and mass flow rates, advantages and disadvantages have also been reviewed. The authors back their findings with available theories. Suitable fluid should be searched for high efficiency in the helical coil.
Highlights
A heat exchanger is a device that is used to transfer thermal energy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperatures and in thermal contact [1] [2]
The author demonstrated that the HCHE provided more excellent heat transfer performance and effectiveness than straight tubes and other heat exchangers because of secondary flow development inside the helical tube, and heat transfer coefficient increased with an increase in the curvature ratio of HCHE for the same flow rates
HCHE are broadly used in heating and cooling applications such as heat recovery system, food industries, nuclear power plant, chemical processing, solar water heater, and refrigeration and air-conditioning units [16] [26]-[32]. [33] reported that the HCHE showed increase in the heat transfer rate, effectiveness and overall heat transfer coefficient over the straight tube heat exchanger on all mass flow rates and operating conditions
Summary
A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperatures and in thermal contact [1] [2]. This secondary flow has the ability for heat transfer enhancement due to mixing of fluid in the tube [4]. [16] reported that the improvement in heat transfer rate in curve tube tubes was due to the centrifugal force which pushed the fluid particles toward the core region that produced a secondary flow field. The intensity of secondary flow [17] [18] developed in the tube is the function of tube diameter (d) and coil diameter (D) This increase in intensity of secondary flow allows proper mixing of the fluid, which enhances heat transfer coefficient for the same flow rate. This increase in intensity of secondary flow allows proper mixing of the fluid, which enhances heat transfer coefficient for the same flow rate. [19] reported the increase in tube and coil diameter, reduced the secondary flow developed and in turn reduced heat transfer coefficient
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