Heat Transfer Characteristics in a Double-Pipe Heat Exchanger Equipped with Coiled Circular Wires

Zohir, A. E.; Habib, Mohamed A.; Nemitallah, Medhat A.

doi:10.1080/08916152.2014.915271

Cited by 45 publications

(10 citation statements)

References 24 publications

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“…Also, using of varied pitch coil or coil with varied width coil had no further improvement than uniform pitch coil. Experimental work was done by Zohir et al [14] using insulated wire coil on the outer surface of the inner tube as turbulator and studied its effect on the heat transfer rate. The coils used had 2 mm diameter and pitch, P = 6, 12 and 20 mm.…”

Section: Dizaji Et Al[6]mentioning

confidence: 99%

Performance Enhancement of Double Tube Heat Exchanger Using Coiled Fins

Khalil

El-Agouz

Zohir

et al. 2019

Journal of Engineering Research

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Section: Dizaji Et Al[6]mentioning

confidence: 99%

Performance Enhancement of Double Tube Heat Exchanger Using Coiled Fins

Khalil

El-Agouz

Zohir

et al. 2019

Journal of Engineering Research

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“…Как показано в данном исследовании, эффективность теплообменника в случае нагрева отличается от эффективности в случае охлаждения. В случае нагрева поглощенное холодной жидкостью тепло, в то время как в случае охлаждения это функция тепла, отдаваемого горячей жидкостью [16]. На рис.…”

Section: рис 4 распределение температурыunclassified

Simulation of the effectiveness of longitudinal rectangular fins on the efficiency of the double pipe heat exchanger

Тимербаев

Ali

Almohamed

et al. 2019

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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In this article, a mathematical simulation of a double pipe heat exchanger is carried out, having the longitudinal rectangular fins with the dimension of (2*3*1000) mm, mounted on the outer surface of the inner tube of the heat exchanger. In this paper, the advantage of using of that type of fins and its effect on the effectiveness of the heat exchanger are studied with the help of the computer program. The carried out research allowsmaking the calculation to find the optimum design parameters of heat exchangers. The outer tube diameter is (34.1mm) while the inner tube diameter is (16.05mm). The tubes wall thickness is (1.5mm) and the model length was (1 m). The hot water is flowing through the inner tube in parallel with the cold water that passing the outer tube. The hot and cold water temperature at the inlet is (75°C & 30°C) respectively. The mass flow rate inside the central pipe is (0.1 kg/s) while the annular pipe carrying (0.3 kg/s). In the present work, the program ANSYS Workbench 15.0 was used to find out the results of heat transfer as well as the behavior of liquids inside the heat exchangers.

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“…Significant studies have already been done on the various types of passive techniques like twisted tape, 17,18 louvered strip, and wire coil (spring) inserts 17–37 . These inserts augment the rate of heat transfer at cost of enhanced pumping power inside tubes.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer in a triple tube heat exchanger with coiled spring inserts

Kumar

Prakash

2021

Heat Trans

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Experiments have been performed to investigate the effect of coiled spring inserts on heat transfer, pressure drop, and performance parameters of a triple tube heat exchanger (TTHX). Three different spring inserts having a pitch of 5, 10, and 15 mm are used and the diameter of the spring wire is taken as 1 mm. The experiments were carried out under a turbulent flow regime, with water as a working medium in parallel and counter flow configurations. The variation in different performance characteristics like heat transfer coefficient, Nusselt number, and effectiveness have been compared at various Reynolds numbers ranging between 4000 and 16,000 in the considered flow patterns. The Nusselt number of TTHX with the lowest pitch spring is found to be higher than that of the plain TTHX by 57.27% at Re = 4000 for the counter flow configuration. Both the thermal performance factor and effectiveness increased as the pitch of the spring insert was decreased. The effectiveness of TTHX with the lowest pitch spring insert is found higher than that of the plain TTHX by 43.84% in the counter flow pattern.

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Heat Transfer Characteristics in a Double-Pipe Heat Exchanger Equipped with Coiled Circular Wires

Cited by 45 publications

References 24 publications

Performance Enhancement of Double Tube Heat Exchanger Using Coiled Fins

Performance Enhancement of Double Tube Heat Exchanger Using Coiled Fins

Simulation of the effectiveness of longitudinal rectangular fins on the efficiency of the double pipe heat exchanger

Experimental investigation of heat transfer in a triple tube heat exchanger with coiled spring inserts

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