Heat transfer enhancement in solar air channel with broken multiple V-type baffle

Kumar, Raj; Kumar, Anil; Chauhan, Ranchan; Sethi, Muneesh

doi:10.1016/j.csite.2016.07.001

Cited by 61 publications

(13 citation statements)

References 26 publications

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“…The heat transfer behavior of the solar air channel of aspect ratio of 10.0 with 60° angled broken multiple V-type baffles is analyzed experimentally by Kumar et al, [6]. The obtained experimental results showed that higher overall thermal performance occurred at a relative baffle width of 5.0.…”

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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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: 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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“…Heat exchanger plays a major role in heat reduction in many industries like chemical, food, electronics, refrigeration, petrochemical, automobiles and space applications. [1][2][3][4][5][6] Reduction in the size, less cost, and simplicity are important factors in selection of a heat exchanger. Studies on twisted tapes to enhance the heat transfer have been carried out for the past 10 years.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on heat transfer augmentation of transverse twisted tapes in a confined rectangular channel

Jaganathan

Sivasubramanian

2020

Measurement and Control

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This study investigates the influence of twisted tape inserts on a flow pathway in transverse direction of a flow situation. An array of twisted tapes was mounted on the confined channel to disturb the flow to enhance the heat transfer. The test section had 20 twisted tapes of 35-mm height, 10-mm width and a twist angle of 180°mounted on a silica gelcoated plate. Experiments were conducted on the fabricated experimental setup for different discharge conditions. The Reynolds number considered for the study ranged from 2300 to 3500, and the heat inputs varied from 50 to 250 W, with an interval of 50 W. To visualize the presence of twisted tapes on the flow path, the rectangular channel was visualized by laser flow visualization method, which reported the impact of the twisted tapes on the flow. The existence of twisted tape affects the flow, and it forms a swirl that provides a proper mixing of fluid to enhance heat transfer. The outcome of the present investigation provides a solution to enhance heat transfer and proposes the use of twisted tapes instead of using segmented fins in design of fins.

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“…The V-baffle can induce the vortex flow, which disturbs the thermal boundary layer on the channel wall, that the reason for heat transfer rate and thermal performance enhancements. Many investigators had been reported about the augmentations on heat transfer rate and thermal efficiency by inserted the V-shaped baffle/rib in the heat exchanger channel [Boonloi (2014), Boonloi and Jedsadaratanachai (2014), Boonloi and Jedsadaratanachai (2016), Jedsadaratanachai and Boonloi (2014), Jedsadaratanachai et al (2015), Kumar et al (2017a), Kumar et al (2017b), Kumar et al (2016), Li et al (2018), Promvonge (2010), Promvonge and Kwankaomeng (2010), Promvonge et al (2012), Kumar et al (2019)]. The researchers reported that the V-shaped baffle gives higher heat transfer rate and efficiency when compared with the other types of the vortex generators.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Gap Spacing Ratio on Flow Structure and Heat Transfer Characteristic for the v-Orifice in the Square Channel Heat Exchanger

Jedsadaratanachai¹,

Boonloi²

2019

Frontiers in Heat and Mass Transfer

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The variations of flow and heat transfer in the square channel heat exchanger inserted with various parameters of V-orifice are investigated numerically. The influences of flow directions (V-Downstream and V-Upstream), gap spacing ratios (g/H or GR = 0, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30) and blockage ratios (b/H or BR = 0.05, 0.10, 0.15, 0.25 and 0.30) on flow topology and heat transfer behavior are reported. The laminar flow regime with the Reynolds number in the range 100 -2000 is considered. The numerical results are presented in terms of flow and heat transfer structure in the heat exchanger channel. The thermal performance assessments in the square channel with V-orifice are also concluded. As the numerical results, the gap between the V-orifice and channel walls changes the flow and heat transfer mechanisms in the channel. The gap can reduce the friction loss in the channel and also helps to increase the turbulence of the flow. The optimum gap spacing ratio may help to increase the thermal performance of the square channel heat exchanger.

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Heat transfer enhancement in solar air channel with broken multiple V-type baffle

Cited by 61 publications

References 26 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

Experimental investigation on heat transfer augmentation of transverse twisted tapes in a confined rectangular channel

The Effects of Gap Spacing Ratio on Flow Structure and Heat Transfer Characteristic for the v-Orifice in the Square Channel Heat Exchanger

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