Thermal characterization in a circular tube fitted with inclined horseshoe baffles

Promvonge, Pongjet; Tamna, Sombat; Pimsarn, Monsak; Thianpong, Chinaruk

doi:10.1016/j.applthermaleng.2014.10.045

Cited by 78 publications

(27 citation statements)

References 33 publications

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“…For validation of the accuracy of the numerical procedure, the average Nusselt number obtained from the current numerical approach is compared with the experimental data reported by Promvonge et al, [4] as displayed in Figure 2. The numerical method is carried out for the smooth tube (without baffles) and with horseshoe-baffles condition at blockage ratios=0.2 and pitch ratio=0.5.…”

Section: Code Validationmentioning

confidence: 99%

“…In another respect, Promvonge et al, [4] examined the influence of inclined horseshoes baffles placed repeatedly in a tubular heat exchanger on thermal enhancement factor. The horseshoe baffle elements with an inclination angle of 20 were inserted periodically into the test tube at three different baffle-pitch ratios (PR = 0.5, 1.0 and 2) and -width or blockage ratios (BR = 0.1, 0.15 and 0.2).…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Heat Transfer Enhancement in a Curved Channel with Baffles

Al-Juhaishi

Fawzi

Mohammad

2020

ARFMTS

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Curved channel is commonly used in cement mill's journal bearing. In this study, heat transfer enhancement of curved channel having a rectangular cross-section with using inclined shape baffles is numerically investigated. The effects of different parameters of baffles, i.e. attack angle (α= 45°, 60°, and 90°), and the number of baffles (NB=9 and 13 baffles) are examined. The water is selected as working fluid for laminar and turbulent flow region. A standard k-turbulence model together with enhanced wall treatment is applied to solve the complex flow in Re of 500-5000. Influences of those parameters on heat transfer and friction performances in terms of Nusselt number, friction factor , Nussellt number enhancement ratio, and thermal performance factor, respectively are studied. The results show that the best condition to achieve maximum heat transfer at angle = 90°, NB=13 and Re=5000 compared with other conditions. Furthermore, the maximum thermal performance factor (TEF) of the curved channel with using baffles is 4.4 at the same condition. This indicated that the geometry of baffles inside curved channel can improve the heat transfer significantly with reasonable increase in friction losses.

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Section: Code Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study on Heat Transfer Enhancement in a Curved Channel with Baffles

Al-Juhaishi

Fawzi

Mohammad

2020

ARFMTS

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“…Many new types of turbulence promoters have been developed recently. Comment types are: twisted tapes [20][21][22][23][24], winglets tapes [25,26], circular rings [23,27], horseshoe baffles [28], Advances in Heat Exchangers helical inserts [29], and coil wires [30]. The optimization of their design for improving thermohydraulic performance has been the focus of research.…”

Section: Turbulence Promoters For Tubular Geometriesmentioning

confidence: 99%

“…This case was reported in [27] for the v-shaped rings. Other types of geometries are: the inclined horseshoe [28] and the triple helical tape insert [29]. Most thermohydraulic performance expressions derived from experimental work have derived using water and air as thermal fluids under turbulent conditions.…”

Section: Turbulence Promoters For Tubular Geometriesmentioning

confidence: 99%

Use of Heat Transfer Enhancement Techniques in the Design of Heat Exchangers

Picón‐Núñez¹,

Melo-González²,

Castillo³

2019

Advances in Heat Exchangers

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Heat transfer enhancement refers to application of basic concepts of heat transfer processes to improve the rate of heat removal or deposition on a surface. In the flow of a clean fluid through the tube of a heat exchanger, the boundary layer theorem establishes that a laminar sublayer exists where the fluid velocity is minimal. Heat transfer through this stagnant layer is mainly dominated by thermal conduction, becoming the major resistance to heat transfer. From an engineering point of view, heat transfer can be enhanced if this stagnant layer is partially removed or eliminated. In single-phase heat transfer processes, three options are available to increase the heat transfer rate. One of them is the choice of smaller free flow sectional area for increased fluid velocity bringing about a reduction of the thickness of the laminar sublayer. A second option is the engineering of new surfaces which cause increased local turbulence, and the third option consists in the use of mechanical inserts that promote local turbulence. The application of these alternatives is limited by the pressure drop. This chapter describes the concept of heat transfer enhancement and the ways it is applied to the development of new heat exchanger technology.

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“…However, the heat transfer increase as associated with important pressure drop ranging from 1 to17 times above the channel without baffles. The horse shoes baffles used by Promvonge et al (2015) in tubular heat exchangers offered a considerable improvement of heat transfer coefficient tend to 92-208%, but with an increase in the friction factor by about 1.76 to 6.37 times compared with the smooth tube, i.e. a thermal performance factor varied from 1.34 to 1.92.…”

Section: Introductionmentioning

confidence: 99%

CFD Investigations of Thermal and Dynamic Behaviors in a Tubular Heat Exchanger With Butterfly Baffles

Karima¹,

Sahel²,

Ali³

et al. 2018

Frontiers in Heat and Mass Transfer

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In the present paper, the effects of a new baffle design on the efficiency of a tubular heat exchanger are numerically investigated. It concerns butterfly baffles inserted in a cylindrical tube heat exchanger. We focus on the influence of the shape of baffles, the space between baffles (pitch ratio, PR) and the baffle size (i.e. the blockage ratio, BR) on the heat transfer and flow characteristics. Three geometrical configurations with different PRs are realized (PR = 1, 2 and 4) and five others with different blockage ratios (BR = 0.1, 0.2, 0.3, 0.4 and 0.5). The investigations are achieved for Reynolds numbers ranging from 3000 to 8000. All analyses are realized with the help of the CFD Fluent software. The numerical results are compared with available experimental data and a satisfactory agreement is found. The obtained results showed that the butterfly baffle with PR = 4 and BR = 0.1 is the best design that ensures the best flow mixing and increases the thermal enhancement factor by about 1.7 time with a moderate pressure drop.

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Thermal characterization in a circular tube fitted with inclined horseshoe baffles

Cited by 78 publications

References 33 publications

Numerical Study on Heat Transfer Enhancement in a Curved Channel with Baffles

Numerical Study on Heat Transfer Enhancement in a Curved Channel with Baffles

Use of Heat Transfer Enhancement Techniques in the Design of Heat Exchangers

CFD Investigations of Thermal and Dynamic Behaviors in a Tubular Heat Exchanger With Butterfly Baffles

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