CFD Analysis of Double Tube Helical Coil Heat Exchanger for Different Heat Transfer Characteristics.

Dradhomar, Priyanshu; Verma, Subhashini; Singh, Vikas K.; Dradhomar, Pallavi; Manjunatha, M. V.

doi:10.21474/ijar01/4006

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…During the study, it was discovered that centrifugal forces formed a high velocity zone on the outer side of the hollow helical tubes' walls, where the friction factor fell with a propensity to enhance turbulence. Also, when the number of turns through a double-tube helical heat exchanger is altered, the findings revealed that as the number of rotations increases, the rate of heat transmission increases [8]. Fouda et al [9] analyze the heat transfer properties and performance of a multitube in tube helically coiled heat exchanger statistically and it has been found that with increasing Reynolds numbers of hot and cold water, the total heat transfer coefficient (Uo) increased by 23% and 28%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate

Najm

Jumaah

Karim

2022

DJES

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The goal of this work was to design a simple and cost-effective technique for improving the performance of heat exchangers, and the emphasis was on the experimental side while not neglecting the necessity of validating our findings with theoretical results using CFD. A new method was used to enhance the heat transfer inside the heat exchanger by using a coil with modified steps, as the published papers did not previously address this method, which proved its effectiveness. For varied coil pitches, the numerical findings were in good agreement with the experimentally obtained results, with an error rate of less than 8%. To compare results and confirm effective correlation between pitch changes, a double coil tube is manufactured with a fixed pitch and a double coil tube with modified pitches, while maintaining the basic design parameters of tube diameter ( ), shell diameter ( ), height of shell ( ), and coil height ( ) in order to try to increase the overall heat transfer coefficient and heat transfer. This new design enhanced heat transfer and total heat transfer coefficient at Reynolds number (400< <2000), with a 22% improvement in overall heat transfer coefficient. The new design of the coil (modified pitch) also gave an improvement in the flow distribution, which generated a higher secondary flow than the traditional pitch coil.

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Section: Introductionmentioning

confidence: 99%

Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate

Najm

Jumaah

Karim

2022

DJES

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Experimental and numerical investigation of heat transfer enhancement in double coil heat exchanger

NAJM,

D.J. AZZAWI,

A. KARIM

2022

Journal of Thermal Engineering

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In the current work, a substantial research and cost-effective strategy has been conducted to enhance the thermal efficiency of shell and coil heat exchangers, and geometrical modifica-tion is one technique to improve the exchange of thermal energy between two or more fluids. Therefore, experimental and numerical analysis across a shell and single/double coil heat ex-changer at constant temperatures of 36 °C for cold water and 65 °C for hot water are studied. Various coil pitches (baseline pitch, P-2P-P and 2P-P-2P) and mass flow rates (1 L/min for hot water and 2, 4, 6, and 8 L / min for cold water) were studied. The present experimental results for single and double coil heat exchangers were in good agreement with previous research’s numerical study, with an error rate of 9% and 5%, respectively. Moreover, the numerical find-ings revealed that modifying the double coil pitch improves the heat transfer rate by 10% com-pared to a baseline case. Following the encouraging simulation findings, improving the heat exchanger’s performance by utilizing more than one pitch for the same coil is a novel method that has not yet been reported. Therefore, when comparing the modified pitch of a double coil heat exchanger to a conventional coil under the same conditions (400

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Heat Transfer in Helical Coil Heat Exchanger

Inyang¹,

Uwa²

2022

ACES

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CFD Analysis of Double Tube Helical Coil Heat Exchanger for Different Heat Transfer Characteristics.

Cited by 3 publications

References 3 publications

Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate

Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate

Experimental and numerical investigation of heat transfer enhancement in double coil heat exchanger

Heat Transfer in Helical Coil Heat Exchanger

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