Effects of wavy ribs on vortex generation and thermal-hydraulic performance in a rotating rectangular channel

Moradi, Tofigh; Shahbazian, Hamidreza; Hoseinalipour, Mostafa; Sundén, Bengt

doi:10.1016/j.applthermaleng.2022.119952

Cited by 12 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In smooth and ribbed ducts, the performance of heat flow was diverse depending on the Reynolds (Re) number level. In other words, the laminar, transient, and turbulent flow behaviors in these ducts have been reported by prior studies depending on this number [18,19]. In the early studies, the heat flow of non-circular smooth ducts was gradient at 1000 ≤ Re ≤ 2000 and tended to be stable [5][6][7].…”

Section: Introductionmentioning

confidence: 64%

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Hameed,

Mohammed,

Abbas

2023

JSE

View full text Add to dashboard Cite

This study presents a detailed Computational fluid dynamics (CFD) analysis, focusing on optimizing laminar flow within non-circular ducts, specifically those with square, rectangular, and triangular configurations. The study centers on the effective use of mesh quality and size in these ducts, a factor which is previously underrepresented in those CFD studies that predominantly emphasized turbulent rather than laminar flows. With the help of finite element approach, this study compares the performance of these non-circular ducts, employing Reynolds numbers ranging from 1600 to 2000 and mesh sizes of 6, 12, and 18 mm. A ribbed duct style, arranged in a hybrid manner, is adopted to further this study. Analysis in this paper applied the Single predictive optimization (SPO) technique to the identification of the K-ε-Standard as the preferred viscosity model and a hybrid rib distribution as optimal within the triangular duct configuration. Parameters of a Reynolds number of 1600 and a mesh size of 18 mm emerged as the most effective values for this duct style. Then, the attained results of the Analysis of variance (ANOVA) indicated the F-Criterion's insignificance for Reynolds laminar levels, rendering the laminar viscosity model less relevant within the test section. Additionally, the implementation of the Six sigma procedure (SSP) markedly enhanced both the performance factor (PF) and turbulence intensity, which were observed at 4.90% and 146.77%, respectively. This improvement was most notable in the triangular duct, characterized by rib heights of 66 mm (semi-circle), 66 mm (rectangular), and 38.126 mm (triangular).

show abstract

Section: Introductionmentioning

confidence: 64%

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Hameed,

Mohammed,

Abbas

2023

JSE

View full text Add to dashboard Cite

show abstract

“…where the pressure drop of airflow over the test channel is Δp, the average velocity in the test channel is u, and the length of the test channel is L, which is 245 mm. The performance evaluation criteria (PEC) factor measures the improvement in overall thermal-hydraulic performance caused by passive enhancing techniques, and it is calculated as follows (Li et al, 2020;Moradi et al, 2023):…”

Section: Data Reductionmentioning

confidence: 99%

Flow and Heat Transfer Characteristics in Channels With Piriform Dimples and Protrusions

Oyewola¹,

Petinrin²,

Sanusi³

2023

Front. Heat Mass Transf.

View full text Add to dashboard Cite

The flow and heat transfer behaviour of channels with dimples and protrusions of spherical and piriform shapes was numerically explored by solving the Navier-Stokes and energy equations with a CFD software, the ANSYS Fluent 19.3, in the range of Reynolds numbers from 8,500 to 59,000. The values of the Nusselt number and friction factors were estimated and the non-dimensional Performance Evaluation Criterion (PEC) was determined to measure the thermal-hydraulic performance. The results reveal that the piriform protruded channel demonstrated a higher thermal performance with Nusselt number values of 36%, 15%, 23%, and 9% than the smooth, spherical dimpled, piriform dimpled, and spherical protruded channels, respectively. This indicates that heat transfer is enhanced by the turbulent mixing caused by the roughened surfaces of the channels. Nevertheless, the smooth channel had the lowest pressure drop with the friction factor of 20%, 7%, 21% and 27% less than that of spherical dimpled, piriform dimpled, spherical protruded, and piriform protruded channels, respectively. In the Reynolds number range, lower Nusselt number ratios and friction factor ratios were observed in the piriform dimpled channel compared to other enhanced-surface channels. The overall performance based on the thermal-hydraulic analysis indicated that the channel with piriform protrusions performed better with the highest PEC value of 3.77 times higher than the smooth-surface channel.

show abstract

“…С целью продления ресурса сопловых и рабочих лопаток газовых турбин в высокотемпературных условиях применяются различные способы воздушного охлаждения. Одним из способов повышения эффективности охлаждения является турбулизация потока в пристеночной зоне лопаток, которая осуществляется нанесением на поверхность лопаток ребер [2,3], сферических углублений [4,5], вихревых матриц [6,7] и т.д. Для охлаждения внешней поверхности лопаток газовых турбин применяется пленочное охлаждение [8,9].…”

Section: Introductionunclassified

Use of Honeycomb Surface to Increase the Heat Exchange Intensity in Nozzle Blades of Gas Turbines

Perevezentsev,

Shilin,

Doroshenkov

et al. 2024

Automation and Modeling in Design and Management

View full text Add to dashboard Cite

The results of a numerical study of a flat plate containing honeycomb cells without holes for blowing cooling air onto the plate surface, and a flat plate containing honeycomb cells with holes in each cell for blowing cooling air onto the plate surface are presented. Holes in the cells of the honeycomb structure for blowing cooling air on the outer surface of the plate contribute to creating a film of cooling air on the outer surface of the plate (film cooling). Since there are more holes for blowing cooling air in the honeycomb design than in film cooling, this method of cooling a gas turbine blade is comparable to effusion cooling, which is considered one of the most effective methods, and this cooling method is located between film and transpiration (porous) cooling. The study used a combined cooling method that puts together both a convective cooling method due to the swirling movement of cooling air inside the honeycomb structure cells located on the blade inner surface, and an effusion cooling method, implemented by blowing cooling air onto the blade surface through holes in each honeycomb cell.

show abstract

Effects of wavy ribs on vortex generation and thermal-hydraulic performance in a rotating rectangular channel

Cited by 12 publications

References 46 publications

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Flow and Heat Transfer Characteristics in Channels With Piriform Dimples and Protrusions

Use of Honeycomb Surface to Increase the Heat Exchange Intensity in Nozzle Blades of Gas Turbines

Contact Info

Product

Resources

About