Heat transfer performance for turbulent flow through a tube using double helical tape inserts

Bhuiya, M.M.K.; Chowdhury, Morsaleen Shehzad; Ahamed, Jamal Uddin; Khan, Mohammad Jakir Hossain; Sarkar, Mrinmoy; Kalam, M.A.; Masjuki, H.H.; Shahabuddin, M.

doi:10.1016/j.icheatmasstransfer.2012.04.006

Cited by 35 publications

(14 citation statements)

References 21 publications

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“…It was clearly noted that the Nusselt number, friction factors, and thermal enhancement efficiency were increased by decreasing of helix angles under the same operating conditions. As it is shown in Figure 16, the maximum thermal enhancement efficiency ( ) of 215% was found with use of the double helical tape insert with helix angle 9 ∘ at high Reynolds number [43].…”

Section: Helical Screw Insertmentioning

confidence: 80%

“…Bhuiya et al [43] investigated experimentally the enhancement of heat transfer of a tube fitted with double helical tape inserts with different helix angles. It was clearly noted that the Nusselt number, friction factors, and thermal enhancement efficiency were increased by decreasing of helix angles under the same operating conditions.…”

Section: Helical Screw Insertmentioning

confidence: 99%

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Heat Transfer Enhancement by Using Different Types of Inserts

Tabatabaeikia

Mohammed

Ghazali

et al. 2014

Advances in Mechanical Engineering

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Heat transfer enhancement has been always a significantly interesting topic in order to develop high efficient, low cost, light weight, and small heat exchangers. The energy cost and environmental issue are also encouraging researchers to achieve better performance than the existing designs. Two of the most effective ways to achieve higher heat transfer rate in heat exchangers are using different kinds of inserts and modifying the heat exchanger tubes. There are different kinds of inserts employed in the heat exchanger tubes such as helical/twisted tapes, coiled wires, ribs/fins/baffles, and winglets. This paper presents an overview about the early studies on the improvement of the performance of thermal systems by using different kinds of inserts. Louvered strip insert had better function in backward flow compared to forward one. Modifying the shape of twisted tapes led to a higher efficiency in most of the cases excpet for perforated twisted tape and notched twisted tape. Combination of various inserts and tube with artificial roughness provided promising results. In case of using various propeller types, heat transfer enhancement was dependent on higher number of blades and blade angle and lower pitch ratio.

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Section: Helical Screw Insertmentioning

confidence: 80%

Section: Helical Screw Insertmentioning

confidence: 99%

Heat Transfer Enhancement by Using Different Types of Inserts

Tabatabaeikia

Mohammed

Ghazali

et al. 2014

Advances in Mechanical Engineering

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“…It was found that the heat transfer rate and friction factor increase as the tape twist ratio and helical pitch ratio decrease, while the thermal performance shows opposite trend, whereas the highest thermal performance factor was found at 1.29 for y/W = 3 and P/D = 2. The influence of the double helical tapes at different helix angles on heat transfer and pressure drop characteristics was investigated in the work [14]. It was found that the heat transfer and friction factor were increased up to 3.05 times and 1.7 times of the plain tube.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance enhancement in tubes using helically twisted tape with alternate axis inserts

Yongsiri¹,

Thianpong²,

Nanan

et al. 2016

Thermophys. Aeromech.

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This article presents an investigation on heat transfer enhancement in a round tube inserted with a helically twisted tape. The effects of a helically twisted tape with alternate axis (HTT-A) on heat transfer, friction factor, and thermal performance factor behaviours are reported for the turbulent regime. HTT-A geometries are tape pitch to tube diameter, P/D = 1.0, 1.5, and 2.0; alternate length to pitch length, l/P = 1.0, 1.5, and 2.0; twisted length to tape width, y/W = 3.0; and tape width to tube diameter, w/D = 0.2. The experiment has been performed by varying the volumetric air flow rate in order to adjust Reynolds number ranging from 6 000 to 20 000. The wall of the testing tube is uniformly heated as a constant heat flux while the tests are covered with thermal insulations to reduce heat loss to surroundings. Thermal performance is evaluated by comparing the present experimental results with the results of the modified HTT-A and also those obtained from previous study (conventional helically twisted tape, HTT). The thermal performance of tested tube with HTT-A is evaluated to obtain the degree of heat transfer enhancement and friction factor induced by HTT-A with respect to the plain tube under the same test conditions. Evenly, it is interesting to observe that the tube with HTT-A consistently possesses higher heat transfer and thermal performance factor than those with the HTT around 14.1% and 1.9%, respectively. The HTT-A with the smaller pitch ratio and adjacent twist length provides higher heat transfer rate and friction factor than the one with larger pitch ratio and alternate length as a result of a larger contact surface area, stronger swirl intensity and, thus, better fluid mixing near the tube wall. In the range determined, the tubes with the largest pitch ratio (P/D = 2.0) and smallest alternate length (l/P = 1.0) give the highest thermal performance factor at around 1.35. In addition, the empirical correlations of the Nusselt number, friction factor, and thermal performance factor are also described.

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“…The helical tapes with several geometries were employed for the purpose, such as the helical tape with and without a centered rod by Eiamsa-ard and Promvonge (2005Promvonge ( , 2007, regularly spaced helical screw-tape inserts developed by Sivashanmugam and Suresh (2006, 2007a, 2007b, 2007c, right-left helical inserts by Sivashanmugam et al (2008), Sivashanmugam and Nagarajan (2007), and Nagarajan and Sivashanmugam (2009), helical screw inserts with different spacer lengths by Ibrahim (2011), and double-helical tape inserts with different helix angles by Bhuiya et al (2012). Most of the modified helical tapes offer higher heat transfer rates than the typical ones, as they possess parts that are capable of inducing extra turbulence.…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic Performance of Heat Exchanger Tube Equipped with Single-, Double-, and Triple-Helical Twisted Tapes

Eiamsa-ard

Nanan

Wongcharee

et al. 2014

Chemical Engineering Communications

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Heat transfer augmentation by dual-helical twisted tapes (D-HTTs) and triple-helical twisted tapes (T-HTTs) is presented in comparison with that by single-helical twisted tape (S-HTT). The effects of tape width ratio (w=D ¼ 0.1, 0.15, and 0.2) on heat transfer, friction factor, and thermal performance are also reported. The experiments were performed using air as a working fluid for Reynolds number between 6000 and 20,000. At similar conditions, the use of D-HTTs and T-HTTs leads to the increase of Nusselt number by respectively 15.6% to 17.6% and 19.5% to 23.4%, the increase of friction factor by respectively 83% to 206% and 143% to 335%, and the decrease of thermal performance factor by 3.9% to 20.3% and 8.3% to 26.2% compared to those obtained from the use of S-HTT=promoter. As the width ratio increases, both Nusselt number and friction factor are considerably increased. However, due to the poorer trade-off between the increases of Nusselt number and friction factor, lower thermal performance factor is consistently obtained at the conditions possessing higher Nusselt number. At similar conditions, S-HTTs consistently give a higher thermal performance factor than D-HTTs and T-HTTs; the maximum thermal performance factors given by S-HTTs with w=D of 0.1, 0.15, and 0.2 are 1.34, 1.31, and 1.29, respectively (at Reynolds number of 6000).

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Heat transfer performance for turbulent flow through a tube using double helical tape inserts

Cited by 35 publications

References 21 publications

Heat Transfer Enhancement by Using Different Types of Inserts

Heat Transfer Enhancement by Using Different Types of Inserts

Thermal performance enhancement in tubes using helically twisted tape with alternate axis inserts

Thermohydraulic Performance of Heat Exchanger Tube Equipped with Single-, Double-, and Triple-Helical Twisted Tapes

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