Numerical Heat Transfer Investigation in a Heat Exchanger Tube with Hexagonal Conical-ring Inserts

Sripattanapipat, Somchai; Tamna, Sombat; Jayranaiwachira, Nuthvipa; Promvonge, Pongjet

doi:10.1016/j.egypro.2016.10.213

Cited by 28 publications

(15 citation statements)

References 7 publications

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“…The average Nusselt number and friction factor values of plain tube case are validated with those from empirical correlations of Gnielinski [11] and Blasius [12] The results of average Nusselt number against Reynolds number for the two cases of TR and different numbers of turbulators are depicted in Figures 6 & 7. It is shown that Nusselt number values show increasing behavior with increasing Re value due to increasing vortex flow near the tube wall which leads to increment heat convection.…”

Section: Resultsmentioning

confidence: 81%

“…The authors reviled that inserting quadruple tapes give maximum heat transfer rate. Using V-shaped hexagonal conical-rings inserts were studied numerically by Sripattanapipat et al [11] for enhancing heat transfer in heat exchanger. These inserts were obtained by cutting both symmetric plane of the cone-tip of hexagonal conical rings at 30 0 , 45 0 and 60 0 to reduce the loss of pressure.…”

Section: Introductionmentioning

confidence: 99%

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Effect of V-Shape Twisted Jaw Turbulators on Thermal Performance of Tube heat exchanger: An Experimental Study

Hussein¹,

Abdulmunem²

2018

ETJ

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The main purpose of the present investigation is enhancing heat transfer rate in a tube heat exchanger by using V-shape twisted Jaws. The air is used as a working fluid and pumped through the test section with different values of Reynolds number (6000-19500), while the heat flux has been selected as a constant boundary condition around the tube section. In this study, two type of twisted jaw turbulators are used with two twisted ratio (TR= 2 & 4) as well as, the effect of using different numbers of turbulators (N= 6, 8 and 10) inside test section with equal distances between pieces are studied. The results indicated that, using augmentations with TR=2 gives better heat transfer rate and thermal performance factor comparing with the other case TR=4. The maximum rate of heat transfer is achieved in case of N=10 by an increased 160.29% for TR=2 and 102% for TR=4 comparing with plain tube case. In addition, results show that the values of thermal performance factor exceed the unity and shows uptrend behavior with rising numbers of turbulators indicating to feasibility of using these turbulators practically.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Effect of V-Shape Twisted Jaw Turbulators on Thermal Performance of Tube heat exchanger: An Experimental Study

Hussein¹,

Abdulmunem²

2018

ETJ

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“…The heat transfer ability in the HETIR is concluded in terms of the local Nusselt number (Nu x ) and average Nusselt number (Nu) as equations (7) and 8, respectively…”

Section: Continuity Equationmentioning

confidence: 99%

Variations of heat transfer mechanism and flow structure in a heat exchanger tube fitted with 30° inclined ring

Boonloi

Jedsadaratanachai

2020

Advances in Mechanical Engineering

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Flow prediction, heat transfer pattern, and thermo-hydraulic efficiency in a heat exchanger tube fitted with vortex generator are chosen for the present research. The 30° inclined ring is opted to develop the performance of the heat exchanger tube. The effects of inclined ring configuration and placement in the heat exchanger tube on the patterns of flow and heat transfer are investigated. The Reynolds number (at the entry zone of the periodic model) in the range of around 100–2000 (laminar flow region) is discussed. The heat transfer ability, pressure loss, and efficiency of the heat exchanger tube fitted with 30° inclined ring are analyzed with the numerical method (finite volume method). The SIMPLE algorithm of the commercial code is picked for the present study. The simulated results in the heat exchanger tube fitted with 30° inclined ring are offered in patterns of streamlines, temperature contour, and Nusselt number contour. From the preliminary result, it is found that the creation model of the heat exchanger tube fitted with 30° inclined ring has sufficient reliance to measure flow and heat transfer profiles. The installment of the 30° inclined ring in the heat exchanger tube leads to greater heat transfer ability and thermo-hydraulic performance because of the creation of the vortex flow and thermal boundary layer disturbance on the heat exchanger tube surface. The heat transfer ability in the heat exchanger tube fitted with 30° inclined ring is found to be around 1.00–10.56 times above the plain circular tube. In addition, the installation of the 30° inclined ring in the heat exchanger tube gives the maximum thermal enhancement factor around 3.18.

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“…Furthermore, many studies investigated the effect of the internal structure of heating ducts on the efficiency of fluid heating. The pipe fitted with different rings in order to enhance the heat transfer rate between the pipe and the fluid was numerically investigated in [2]. Numerical investigations of the thermal and hydraulic characteristics of the turbulent convection of nanofluid flow in a pipe with conical ring inserts were conducted in [3].…”

Section: Introductionmentioning

confidence: 99%

Entransy Dissipation Analysis and New Irreversibility Dimension Ratio of Nanofluid Flow Through Adaptive Heating Elements

Alic

2019

Energies

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A hollow electric heating cylinder is inserted inside a thermo-insulating cylindrical body of larger diameter, together representing a single cylindrical heating element. Three cylindrical heating elements, with an independent electrical source, are arranged alternately one after the other to form a heating duct. The internal diameters of the hollow heating cylinders are different, and the cylinders are arranged from the largest to the smallest in the nanofluid’s flow direction. Through these hollow heating cylinders passes nanofluid, which is thereby heated. The material of the hollow heating cylinders is a PTC (positive temperature coefficient) heating source, which allows maintaining approximately constant temperatures of the cylinders’ surfaces. The analytical analysis used three temperatures of the hollow heating cylinders of 400 K, 500 K, and 600 K. The temperatures of the heating cylinders are varied for each of the three cylindrical heating elements. In the same arrangement, the inner diameters of the hollow cylinders are set to 15 mm, 11 mm, and 7 mm in the nanofluid’s flow direction. The basis of the analytical model is the entransy flow dissipation rate. Furthermore, a new dimension irreversibility ratio is introduced as the ratio between entransy flow dissipation and thermal-generated entropy. This paper provides a suitable basis for optimizing the geometric and process parameters of cylindrical heating elements. An optimization criterion can be maximizing the new dimensionless irreversibility ratio, which implies minimizing thermal entropy and maximizing entransy flow dissipation.

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Numerical Heat Transfer Investigation in a Heat Exchanger Tube with Hexagonal Conical-ring Inserts

Cited by 28 publications

References 7 publications

Effect of V-Shape Twisted Jaw Turbulators on Thermal Performance of Tube heat exchanger: An Experimental Study

Effect of V-Shape Twisted Jaw Turbulators on Thermal Performance of Tube heat exchanger: An Experimental Study

Variations of heat transfer mechanism and flow structure in a heat exchanger tube fitted with 30° inclined ring

Entransy Dissipation Analysis and New Irreversibility Dimension Ratio of Nanofluid Flow Through Adaptive Heating Elements

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