3D simulation of laminar flow and heat transfer in V-baffled square channel

Promvonge, Pongjet; Jedsadaratanachai, Withada; Kwankaomeng, Sutapat; Thianpong, Chinaruk

doi:10.1016/j.icheatmasstransfer.2011.09.004

Cited by 66 publications

(59 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• To keep similarly flow structure and efficiency as the V-shaped baffle • To decrease the pressure loss in the heating system when comparing with the V-baffle • To reduce the low heat transfer regime; four edges of the duct, behind the baffle • To present a new design of the vortex generator, which easy forming and installing in the real system (the concept for installation is stated by Promvonge et al, 2012b) The influences of the blockage ratios (b/H, BR = 0.05-0.20) and flow directions (V-Downstream and VUpstream) are numerically examined with the Reynolds number founded on the channel-hydraulic diameter, Re = 3000-20,000. The pitch ratio of 1 and the flow attack angle of 30° are selected for the present study due to the best thermal efficiency was found at this point .…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Turbulent Forced Convection in Heating Channel Inserted with Discrete V-Shaped Baffles

Boonloi¹,

Jedsadaratanachai²

2016

Journal of Mathematics and Statistics

Self Cite

View full text Add to dashboard Cite

The numerical examinations on flow visualization, heat transfer characteristic and performance improvement in a square duct inserted with discrete V-shaped baffles (DVB) are reported. The DVB is designed to reduce the pressure loss when compared with the V-shaped baffle. The influences of the flow blockage ratios (b/H, BR = 0.05-0.20), V-tip directions (V-Downstream and V-Upstream) are investigated for Reynolds number, Re = 3000-20,000, with a single pitch ratio and flow attack angle of 1 and 30°, respectively. As the results, the DVB can generate the vortex flow and impinging flow through the test section that assists to develop the thermal efficiency. The augmentations on the heat transfer coefficient and pressure drop are around 2.5-5.75 and 4-22.5 times above the smooth duct, respectively. The best thermal efficiency in forms of thermal enhancement factor, TEF, around 2.32 is detected at Re = 3000, BR = 0.10 and V-Upstream.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Turbulent Forced Convection in Heating Channel Inserted with Discrete V-Shaped Baffles

Boonloi¹,

Jedsadaratanachai²

2016

Journal of Mathematics and Statistics

Self Cite

View full text Add to dashboard Cite

show abstract

“…They reported that the fully developed periodic profiles are found around x/D = 7. Promvonge et al (2012) applied the periodic boundary for inlet and outlet of the square channel heat exchanger placed with Vbaffles. They found that the fully developed periodic profiles on flow and heat transfer are around x/D = 8 downstream of the entry.…”

Section: Introductionmentioning

confidence: 99%

Flow and Heat Transfer Profiles in a Square Channel with 45? V-Downstream Orifices

Jedsadaratanachai¹,

Boonloi²

2016

Journal of Mathematics and Statistics

Self Cite

View full text Add to dashboard Cite

Flow and heat transfer profiles in a square channel heat exchanger inserted with 45° V-orifices are presented. The influences of Reynolds number (Re = 3000-10,000) and blockage ratio (BR = 0.05, 0.10, 0.15, 0.20 and 0.25) on periodic concepts are investigated numerically. The computational domain is solved with the finite volume method and SIMPLE algorithm. As the numerical results, the periodic profiles on flow and heat transfer are found when inserted the 45° Vorifices in the square duct. The configurations on flow and heat transfer in the heating section can separated into two sections; periodic profile and fully developed periodic profile. The patterns on flow and heat transfer are similar, but the values are not equal, called "periodic profiles", while the identical on both profiles and values, called "fully developed periodic profiles". In addition, the periodic structures depends on the parameters of the vortex generator, position in the channel and Reynolds number.

show abstract

“…Promvonge et al [8] presented a numerical investigation on laminar flow and heat transfer characteristics in a threedimensional isothermal wall square-channel fitted with inline 45 ∘ V-shaped baffles on two opposite walls. Apparently the longitudinal counter-rotating vortex flows created by the Vbaffle can induce impingement/attachment flows over the walls resulting in a greater increase in heat transfer over the test channel.…”

Section: Introductionmentioning

confidence: 99%

“…In [8,9], the heat transfer augmentation leads to the increase in enlarging pressure. Therefore, the improvement of vortex generators is to reduce the pressure loss that is done by study parameters of the vortex generators, especially, flow attack angle of the vortex generators.…”

Section: Introductionmentioning

confidence: 99%

Effect of Flow Attack Angle of V-Ribs Vortex Generators in a Square Duct on Flow Structure, Heat Transfer, and Performance Improvement

Boonloi

2014

Modelling and Simulation in Engineering

View full text Add to dashboard Cite

A numerical investigation has been carried out to examine the periodic laminar flow and heat transfer characteristics in a threedimensional isothermal wall square duct with 20 ∘ inline V-ribs. The computations are based on the finite volume method, and the SIMPLE algorithm has been implemented. The fluid flow and heat transfer characteristics are presented for Reynolds numbers based on the hydraulic diameter of the square duct ranging from 100 to 2000. To generate main streamwise vortex flows through the tested section, V-ribs with an attack angle of 20 ∘ are mounted in tandem with inline arrangement, pointing downstream (V-Downstream) and pointing upstream (V-Upstream) placed on both the upper and lower walls. Effects of different blockage ratio ( / , BR) with a single pitch ratio ( / , PR) of 1 on heat transfer, pressure loss, and performance in the ribbed tube are studied. Apparently in each of the main vortex flows, streamwise twisted vortex flows can induce impinging flows on the walls of the interbaffle cavity leading to drastic increase in heat transfer rate over the square duct. In addition, the rise in the V-baffle height results in the increase in the Nusselt number and friction factor values. The computational results show that the optimum thermal enhancement factor is about 4.2 at BR = 0.20 and 0.15 for the V-Downstream and V-Upstream, respectively.

show abstract

3D simulation of laminar flow and heat transfer in V-baffled square channel

Cited by 66 publications

References 22 publications

Numerical Investigation on Turbulent Forced Convection in Heating Channel Inserted with Discrete V-Shaped Baffles

Numerical Investigation on Turbulent Forced Convection in Heating Channel Inserted with Discrete V-Shaped Baffles

Flow and Heat Transfer Profiles in a Square Channel with 45? V-Downstream Orifices

Effect of Flow Attack Angle of V-Ribs Vortex Generators in a Square Duct on Flow Structure, Heat Transfer, and Performance Improvement

Contact Info

Product

Resources

About