Turbulent convective heat transfer in helical tube with twisted tape insert

Liaw, Kim Leong; Kurnia, Jundika C.; Sasmito, Agus P.

doi:10.1016/j.ijheatmasstransfer.2021.120918

Cited by 59 publications

(20 citation statements)

References 50 publications

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“…Figure ( 4) presents the relationship between the Nuselt and Reynold numbers during the process, i.e., the higher the Reynold number, the higher the Nuselt number. This is in line with several other studies on heat exchangers that there was a significant relationship between the Nuselt and Reynold numbers, where the higher the Reynold number, the higher the Nuselt number (Putra et al, 2013;Kim et al, 2017;Liaw et al, 2021;and Fouda et al, 2018). An increase in the tube reboiler diameter, increased Reynold and Nuselt number.…”

Section: Effect Of Differences In Diameter Tube Height and Concentrat...supporting

confidence: 92%

Heat Transfer Characteristics in Vertical Tubular Baffle Internal Reboiler through Dimensional Analysis

Susmiati¹,

Purwantana²,

Bintoro³

et al. 2022

IJTech

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Heat transfer in shell and tube heat exchangers is in general described in terms of the relationships of Nuselt, Prandtl, and Reynold dimensionless numbers. One of the parameters of heat exchanger performance is convective heat transfer coefficient (h), and mathematical model can predict it. This study aimed to find out the relationship of the parameters that affected the performance of vertical tubular baffle internal reboiler during ethanol distillation. The mathematical model was developed by a dimensional analysis with the π-Buckingham method. Several influencing parameters during the distillation process were identified to develop a mathematical model. The study was carried out on the distillation process of low-concentration ethanol, i.e., 10%, 20%, 30% using internal reboilers with different tube sizes, i.e., diameters of 1.27 cm, 2.54 cm, 3.81 cm and height of 4 cm, 6 cm, 8 cm, to obtain the value of h observation. Based on the results of the study, a heat transfer model was obtained, i.e., 𝑵𝒖 = 𝟏𝟒𝟓𝟐. 𝟐𝟗 𝑹𝒆 𝟎.𝟑𝟓𝟕 ( 𝑫 𝑳

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Section: Effect Of Differences In Diameter Tube Height and Concentrat...supporting

confidence: 92%

Heat Transfer Characteristics in Vertical Tubular Baffle Internal Reboiler through Dimensional Analysis

Susmiati¹,

Purwantana²,

Bintoro³

et al. 2022

IJTech

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“…Furthermore, friction factors and Nusselt numbers were increased from 1.0 to 17.14 and 0.8 to 2.31 times as compared to the smooth pipe. Different researchers were used various passive devices such as Liaw et al 29 studied the use of twisted tape inserts turbulent heat transfer in a helical tube. Kumar et al 30 modeled the V‐cuts type triangular perforated twisted tape in heat exchanger pipes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of internal thermohydraulic flow and heat transfer improvement in a three‐dimensional circular corrugated tube surfaces based on numerical simulation and design of experiment

Al‐Obaidi

2022

Heat Trans

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To meet the requirements of development in heat exchangers design, the effect of different tubes geometrical parameters on its flow field analysis and thermal heat transfer performance are investigated in the current research work. The hydraulic thermal fluid coupling with computational simulations is applied. The numerical results are solving used flow transport and heat transfer equations, then these results are validated with available experimental data. The behavior of hydraulic and thermal flow in the corrugated tube is discussed with different geometrical parameters' position and shape. Turbulent flow in the tube is calculated in three‐dimensional numerical simulations with optimization of a multiobjective algorithm are analyzed. The influences of various design parameters, for instance, the number of corrugated rings around the tube, distance between each corrugated ring, the diameter of the ring, and pitch of ring are investigated firstly in the flow field and then optimized by using the design of experiment (DOE). The influence of flow structural modifications such as static pressure, dynamic pressure, and pressure drop is taken into consideration as analyzed performance parameters. The DOE method is investigated based on implements and variances the L16 orthogonal arrays are chosen as the experimental strategy. Furthermore, the optimization results found that the maximum value of pressure difference was for corrugated diameter. The numerical method using DOE has enhanced heat transfer rate as compared to the smooth pipe. Moreover, the minimum Tout is for Case 11 (296.49°C) and the maximum Tout is for (303.10°C) hence the value of Nu number for both cases is 32.9 and 42, respectively. That means using this type of passive device can improve the heat transfer in the pipe. The outcomes illustrate that the performance evaluation factor (PEF) ratio of the corrugated pipe with different geometrical configurations is changed and increased as the corrugated pipe geometrically changed and the value of PEF is more than 1.3.

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“…The enhancement in helically coiled tube HX has been extensively investigated numerically and experimentally (Liaw et al, 2020;Darzi et al, 2021;Li et al, 2017;Chang et al, 2020;Cao et al, 2021;Yang et al, 2021;Naghibzadeh et al, 2019;Omidi et al, 2018;Ali and Sabharwall, 2021). Reported results have shown that the helically coiled tube HX induces secondary vortices by centrifugal force, ultimately enhancing heat transfer rates.…”

Section: Introductionmentioning

confidence: 99%

“…Cao et al (2021) investigated a helical tube-intube heat exchanger with a corrugated inner tube and corrugated outer tube, showing the rate of corrugating the outer tube of the heat exchanger increases heat transfer is significantly enhanced when compared to only inner tube corrugation. Twisted tape inserts in circular cross-sectional helical tubes were investigated for both laminar and turbulent flow by Kurnia et al (2020) and Liaw et al (2020). The twisted tape was proven to enhance the secondary flow and heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Laminar Flow Heat Transfer in Helical Oval-Twisted Tube for Heat Exchanger Applications

Almasi‐Hashiani¹,

Wahlquist²,

Yoon³

et al. 2022

Frontiers in Heat and Mass Transfer

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The heat transfer performance of a novel tube configuration that combines the swirling velocity induced by oval-twisting and secondary flow generated by a helical geometrical flow path is presented. The Nusselt number (𝑁𝑢) and friction factor (𝑓) are compared for the laminar flow regime (𝑅𝑒 = 250-2000) under isothermal wall conditions. Under the same flow and boundary conditions, the oval-twisted helical tube increased the 𝑁𝑢 and slightly increased the 𝑓 over the circular helical tube. The best performance with the highest 𝑁𝑢 and lowest 𝑓 occurs at the coil curvature ratio (𝑑 ! /𝐷) of 0.17. The quantified enhancement performance factor (h) shows a 46 -56% increase for the oval-twisted helical tube over the circular helical tube with 𝑑 ! /𝐷 = 0.17. Correlations for the 𝑁𝑢 and 𝑓 are developed and agreed with the numerical results: ± 6% and ± 5% for the 𝑁𝑢 and 𝑓, respectively.

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Turbulent convective heat transfer in helical tube with twisted tape insert

Cited by 59 publications

References 50 publications

Heat Transfer Characteristics in Vertical Tubular Baffle Internal Reboiler through Dimensional Analysis

Heat Transfer Characteristics in Vertical Tubular Baffle Internal Reboiler through Dimensional Analysis

Characterization of internal thermohydraulic flow and heat transfer improvement in a three‐dimensional circular corrugated tube surfaces based on numerical simulation and design of experiment

Laminar Flow Heat Transfer in Helical Oval-Twisted Tube for Heat Exchanger Applications

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