Effect of helical fins on the performance of a double pipe heat exchanger

Sivalakshmi, S.; Raja, M.; Gowtham, G.

doi:10.1016/j.matpr.2020.08.563

Cited by 18 publications

(5 citation statements)

References 10 publications

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“…Mozafarie and Javaherdeh [5] achieved numerically analysis of a heat exchanger by changing pitch values from (25 to 100) mm and the results exposed the maximum percentage increase in heat transfer of 39% obtained in pitch of 25 mm. Sivalakshmi et al, [6] carried out the effect of helical fins on performance of the heat exchanger experimentally and results of study showed that heat exchanger effectiveness and heat transfer rate are 35% and 38.46% higher with helical fin than that of smooth inner pipe. Salman et al, [7] studied performance of heat exchanger made of stainless-steel used to preheat heavy fuel oil by using helical fins with variable pitch (10, 20, and 30 cm) and research showed that higher overall heat transfer coefficient and heat transfer rate when helical fin with pitch equal 10 cm.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Heating Heavy Fuel Oil by Hot Air using Helical Fins in a Double-Pipe Heat Exchanger

Safaa Abdul Adheem Saleh,

Zena Khalefa Kadhim,

Kamil Abdulhusein Khalaf

2024

ARFMTS

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In present work, the effect of helical fins with height 20 mm and pitch 100 mm on the performance of the double pipe heat exchange investigated experimentally. The heat exchanger had been chosen as a heat recovery device in bricks factory to recover heat from exhaust gases to preheat the heavy fuel oil. Air had been chosen as a hot gas instead of furnace exhaust gases because of the similar thermal properties and it flows in the inner pipe with different velocity (20, 27, and 34) m/s and inlet temperature (200, 225) °C while, heavy fuel oil enters shell side with counter flow at mass flow rates (0.06, 0.08, and 0.1) kg/s and constant inlet temperature of 40 °C. Both of pipes and helical fins are made from stainless steel. The experimental results show that increasing Reynolds number from 139139 to 333934 led to increase heat transfer rate, oil outlet temperature, overall heat transfer coefficient and effectiveness of heat exchanger with (8%, 4%, 5% and 5%) respectively while, increasing oil mass flow rate from (0.06 to 0.1) kg/s cause decreasing oil outlet temperature and effectiveness of with (10% ,14%) respectively. The results shown the double pipe heat exchanger with helical fins produce heat transfer rate and oil outlet temperature higher than smooth double pipe heat with average 15% and 8.6%, as well as increasing Nusselt number, Overall heat transfer coefficient and effectiveness of heat exchanger with average 26%,15% and 13% respectively. The results clear that, for 225°C exhaust air and velocity 27 m/s, the application of double pipe with helical fins by preheat heavy fuel oil could reduce the viscosity and reduce electric power required and save 1.69 MW annually for one factory.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study of Heating Heavy Fuel Oil by Hot Air using Helical Fins in a Double-Pipe Heat Exchanger

Safaa Abdul Adheem Saleh,

Zena Khalefa Kadhim,

Kamil Abdulhusein Khalaf

2024

ARFMTS

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“…Safari et al [24] experimentally found that the use of water-titanium oxide nano fluid in the spiral tube with greater curvature increases heat transfer more effectively compared to the use of pure water. Sivalakshmi et al [25] conducted an experimental study on the effect of helical fins on the performance of double tube heat exchanger. Found at a high flow rate, the introduction of the fins increases the heat transfer coefficient by 38.46% and the efficiency of the heat exchanger by 35%.…”

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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“…Sivalakshmi et al. 24 experimentally studied the performance of the DTHE with fixed pitch helical fins. It was found that the heat transfer rate and the efficiency of the annulus were increased by 38.46 % and 35 % on average, respectively.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Double‐Tube Heat Exchanger with Staggered Helical Fins

2022

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A novel double‐tube heat exchanger with staggered helical fins (DTHE‐SHF) is proposed. The mechanism of drag reduction and heat transfer enhancement was analyzed based on the theory of field synergy. Numerical simulations were conducted to study the thermal performance of the DTHE‐SHF. The effects of torsion angle and number of the SHF were investigated. The results indicated that, compared with the double tube heat exchanger with traditional straight helical fins (DTHE‐TSHF), the pressure drop of the DTHE‐SHF is reduced significantly, and the comprehensive performance of the DTHE‐SHF is improved by 10 %–30 %. The average synergy angle between the velocity field and the pressure field is optimized.

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Effect of helical fins on the performance of a double pipe heat exchanger

Cited by 18 publications

References 10 publications

An Experimental Study of Heating Heavy Fuel Oil by Hot Air using Helical Fins in a Double-Pipe Heat Exchanger

An Experimental Study of Heating Heavy Fuel Oil by Hot Air using Helical Fins in a Double-Pipe Heat Exchanger

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

Performance of a Double‐Tube Heat Exchanger with Staggered Helical Fins

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