Heat transfer and single-phase flow in internally grooved tubes

Aroonrat, Kanit; Jumpholkul, Chaiwat; Leelaprachakul, R.; Dalkılıç, Ahmet Selim; Mahian, Omid; Wongwises, Somchai

doi:10.1016/j.icheatmasstransfer.2012.12.001

Cited by 59 publications

(23 citation statements)

References 9 publications

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“…The influence of entropy generation with helical angle was tested and it was found that minimum entropy trend was maximum in the 70-degree helical tube and occur around 60k Reynolds number. Aroonrat et al [9] has determined the Nusselt number and the friction factor for Reynolds number range 4000 to 10000. Although this Reynolds number range is found to be low as compared to the literature seen above, the author has not explicitly mentioned the reason for this low values.…”

Section: Introductionmentioning

confidence: 99%

Numerical flow analysis and heat transfer in smooth and grooved tubes

Jamshed¹,

Qureshi²,

Khalid³

2016

WIT Transactions on Engineering Sciences

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This paper discussed the heat transfer enhancement due to groove formation in a metallic tube. A set of three tubes, namely, the simple metallic tube (SMT), the straight groove tube (SGT) and the helically grooved tube with 12-inch pitch (GT12) were numerically studied. The tube data and experimental findings on it were extracted from published article by Arunrat. Performance criteria through CFD was based on the heat transfer via Nusselt number as well as the friction factor. For the heat transfer performance, it was evaluated with the thermal performance factor given by (Nu/Nus)/(f/fs), whereas Nu is the Nusselt number and f is the friction factor and subscript 's' is for the smooth tube. Two turbulence models were used, viz, k-epsilon realizable and k-omega Shear Stress Transport.Between the two turbulence models tested and the given range of Reynolds number, it was found that k-ω SST is the most suitable candidate for this range of Reynolds number due to its closeness to the experimental data both in the case of the Nusselt and friction factor. Among the three tubes tested and making the simple metallic tube (SMT) the baseline, the GT12 performed better and has performance factor better than the other two at most of the Reynolds numbers.

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Section: Introductionmentioning

confidence: 99%

Numerical flow analysis and heat transfer in smooth and grooved tubes

Jamshed¹,

Qureshi²,

Khalid³

2016

WIT Transactions on Engineering Sciences

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“…The realizable k-ε turbulent model gives relative errors within 10.1 and 6.3 % for the Nusselt number and friction factor, respectively. Page 6 of 15 Figure 5 presents the comparison of the numerical results with experimental results (Aroonrat et al 2013) for using the realizable k-ε turbulent model in the case of the spirally grooved tube with e/D i = 0.028, w/D i = 0.028, and p/D i = 1.78. In the figure, the deviations around 5.15 and 2.03 % for the Nusselt number and friction factor, respectively, are detected.…”

Section: Numerical Validationmentioning

confidence: 99%

“…The spirally grooved tube with e/D = 0.0238, 0.0306, 0.0381, and 0.0475 and the transversely grooved tube with e/D = 0.038, 0.046, and 0.092 were studied. Aroonrat et al (2013) investigated the heat transfer in an internally grooved tube with constant wall heat flux. The internally grooved tube with the grooved depth, e = 0.2 mm, grooved width, w = 0.2 mm, and grooved pitch, p = 12.7, 203, 254, and 305 mm was investigated.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on turbulent forced convection and heat transfer characteristic in spirally semicircle-grooved tube

Promthaisong

Boonloi

Jedsadaratanachai

2016

Int J Mech Mater Eng

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Turbulent forced convection and heat transfer structure in the spirally semicircle-grooved tube heat exchanger are numerically examined. The computational problem is solved by finite volume method (FVM) with the SIMPLE algorithm. The influences of groove depth and helical pitch on heat transfer, pressure loss, and thermal performance are investigated for turbulent regime, Re = 5000-20,000. As a result, the swirling flow is found through the test section due to the groove on the tube wall. The flow structure in the spirally semicircle-grooved tube can separate into two types: main and secondary swirling flows. The main swirling flow is found in all cases, while the secondary swirling flow is detected when DR ≥ 0.06. The swirling flow disturbs the thermal boundary layer on the tube wall that is an important reason for heat transfer augmentation. In range studies, the enhancements on heat transfer and friction loss are around 1.16-1.96 and 1.2-10.8 time above the smooth tube, respectively. The optimum thermal performance is around 1.11, which detected at DR = 0.06, PR = 1.4, and Re = 5000. The correlations of the Nusselt number and friction factor for the spirally semicircle-grooved tube with PR = 1.4 are produced to help to design the tube heat exchanger.

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“…Over the years, many researches on the fluid flow through the grooves and corrugated tubes and their influence on the heat transfer characteristics have been carried out [21][22][23][24][25][26][27][28]. Although many researches have focused on the groove's shape and the flow structure correlated to a heat transfer enhancement on various applications, few have been done on the annulus of the heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

Sunu¹,

Rasta²

2017

Acta Polytech

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Abstract. This investigation was performed to experimentally investigate the enhancement of heat transfer and the friction of an annulus in a double pipe heat exchanger system with rectangular grooves in the turbulent flow regime. The shell is made of acrylic and its diameter is 28 mm. The tube is made of aluminium and its diameter is 20 mm. Grooves were incised in the annulus room with a circumferential pattern, with a groove space of 2 mm, a distance between the grooves of 8 mm and a groove height of 0.3 mm. The experiments consist of temperature and pressure measurement and a flow visualization. Throughout the investigation, the cold fluid flowed in the annulus room. The Reynold number of cold fluid varied from about 31981 to 43601 in a counter flow condition. The volume flow rate of hot fluid remains constant with Reynold number about 30904. Result showed the effect of grooves, which are applied in the annulus room. The grooves induce the pressure drop, the pressure drop in the grooved annulus was greater by about 15.88 % to 16.72 % than the one in the smooth annulus. The total heat transfer enhancement is of 1.09-1.11. Moreover, the use of grooves in the annulus of the heat exchanger not only increase the heat transfer process, but also increase the pressure drop, which is related to the friction factor.

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Heat transfer and single-phase flow in internally grooved tubes

Cited by 59 publications

References 9 publications

Numerical flow analysis and heat transfer in smooth and grooved tubes

Numerical flow analysis and heat transfer in smooth and grooved tubes

Numerical investigation on turbulent forced convection and heat transfer characteristic in spirally semicircle-grooved tube

Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

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