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Relevant bibliographies by topics / Relative roughness pitch

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Academic literature on the topic 'Relative roughness pitch'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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Journal articles on the topic "Relative roughness pitch"

1

Kalpana, Soni*1 &. Surendra Bharti2. "CFD ANALYSIS OF SOLAR AIR HEATER FOR ENHANCEMENT OF HEAT TRANSFER." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 6 (2017): 430–44. https://doi.org/10.5281/zenodo.814587.

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Energy is the basic ingredient to sustain life and development. Work means moving or lifting something, warming or lighting something. There are many sources of energy that help to run the various machines invented by man.A 3-dimensional CFD analysis has been carried out to study heat transfer and fluid flow behavior in a rectangular duct of a solar air heater with one roughened wall having combination of circularand square transverse wire rib roughness. The effect of Reynolds number, roughness height, roughness pitch, relative roughness pitch and relative roughness height on the heat transfer

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2

Hans, V. S., R. S. Gill, and Rupinderpal Singh. "Effect of rib roughness pitch on thermal and thermo-hydraulic performance of a solar air heater roughened artificially with arc rib having gap." Journal of Applied and Natural Science 8, no. 1 (2016): 251–56. http://dx.doi.org/10.31018/jans.v8i1.782.

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This experimental study on a solar air heater having absorber plate roughened artificially by providing roughness in the form of arc ribs having gap was carried out in the Department of Mechanical Engineering, Punjab Agricultural University, Ludhiana, India to study the effect of relative roughness pitch on thermal and thermohydraulic performance as well as to compare the performance of arc rib with gap roughened solar air heater with that of continuous arc rib roughened solar air heater. The roughness geometry parameters included relative roughness height of 0.043, angle of attack of 30 degre

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3

Ajay, Jain, and H. S. Sahu Prof. "CFD Analysis of Solar Air Heater for Enhancenment of Heat Transfer Through Inclined Rib Roughness." International Journal of Trend in Scientific Research and Development 3, no. 1 (2018): 662–67. https://doi.org/10.31142/ijtsrd19057.

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A 3 dimensional CFD analysis has been carried out of solar air heater to study heat transfer and fluid flow behavior in a rectangular duct of a solar air heater with one roughened wall having combination of circular and square transverse wire rib roughness. The effect of Reynolds number, roughness height, roughness pitch, relative roughness pitch and relative roughness height on the heat transfer coefficient and friction factor have been studied. In order to validate the present numerical model, results have been compared with available experimental results under similar flow conditions. CFD I

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4

Mishra, Arin, Aman Mehrotra, and S. Senthur Prabu. "Study on Performance Analysis of a Solar Air Heater with Aerofoil Shaped Rib Roughness Using CFD." ECS Transactions 107, no. 1 (2022): 16065–79. http://dx.doi.org/10.1149/10701.16065ecst.

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Present study investigates the heat transfer, friction factor and fluid flow characteristics of fully developed turbulent flow in a rectangular duct of solar air heater having aerofoil shaped rib-roughness on underside of absorber plate. ANSYS 14.5 has been used to simulate air flow through roughened air heater duct. Effect of relative roughness height and roughness pitch on Nusselt number and friction factor of roughened duct have been investigated and compared with that of smooth duct. It is found that the Nusselt number improves by attaching the roughness. Maximum enhancement in Nusselt num

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5

Rana, Jitesh, Anshuman Silori, Rajesh Maithani, and Sunil Chamoli. "Computational fluid dynamics analysis of a V-rib with gap roughened solar air heater." Thermal Science 22, no. 2 (2018): 963–72. http://dx.doi.org/10.2298/tsci160831010r.

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A CFD analysis of a solar air heater has been carried out using V-shaped ribs as artificial roughness on the absorber plate. The relative roughness pitch, P/e = 6-12, Reynolds number of 3800-18000, relative roughness height, e/D = = 0.042, and angle of attack, ? = 30?-75?, have been selected as design variables of V-shaped rib for analysis. The ANSYS FLUENT 15.0 with renormalization group k-? turbulence model is selected for the analysis of computational domain of solar air heater. The enhancement of Nusselt number and friction factor with Reynolds number for different values of a relative rou

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Tangler, J. L. "Influence of Pitch, Twist, and Taper on a Blade’s Performance Loss due to Roughness." Journal of Solar Energy Engineering 119, no. 3 (1997): 248–52. http://dx.doi.org/10.1115/1.2888027.

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The purpose of this study was to determine the influence of blade geometric parameters such as pitch, twist, and taper on a blade’s sensitivity to leading edge roughness. The approach began with an evaluation of available test data of performance degradation due to roughness effects for several rotors. In addition to airfoil geometry, this evaluation suggested that a rotor’s sensitivity to roughness was also influenced by the blade geometric parameters. Parametric studies were conducted using the PROP93 computer code with wind tunnel airfoil characteristics for smooth and rough surface conditi

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7

Behura, Aruna Kumar, Chinmaya Prasad Mohanty, Manas Ranjan Singh, Ashwini Kumar, Emanoil Linul, and Dipen Kumar Rajak. "Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation." Materials 15, no. 7 (2022): 2541. http://dx.doi.org/10.3390/ma15072541.

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In recent years, sunlight has been used in several fields such as photovoltaic cells, flat plate collectors, solar cookers, green buildings, and agricultural applications. Improved thermal performance has been seen which comes of three sides absorber plate with glass cover compared to the traditional one. This paper presents the Nusselt (Nu) number, collector efficiency factor (CEF), and collector heat removal factor (CHRF) for the optimal solution of three sides artificially roughened solar air heater. Five input variables such as Reynolds (Re) number, relative roughness pitch, relative rough

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8

Yadav, Anil Singh, and J. L. Bhagoria. "Modeling and Simulation of Turbulent Flows through a Solar Air Heater Having Square-Sectioned Transverse Rib Roughness on the Absorber Plate." Scientific World Journal 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/827131.

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Solar air heater is a type of heat exchanger which transforms solar radiation into heat energy. The thermal performance of conventional solar air heater has been found to be poor because of the low convective heat transfer coefficient from the absorber plate to the air. Use of artificial roughness on a surface is an effective technique to enhance the rate of heat transfer. A CFD-based investigation of turbulent flow through a solar air heater roughened with square-sectioned transverse rib roughness has been performed. Three different values of rib-pitch (P) and rib-height (e) have been taken s

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Ajay, Jain, and S. Sahu H. "CFD Analysis of Solar Air Heater Provided with Discrete Inclined Rib Roughness on the Absorber Plate A Review." International Journal of Trend in Scientific Research and Development 2, no. 6 (2018): 703–6. https://doi.org/10.31142/ijtsrd18686.

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Heat transfer enhancement is a subject of considerable interest to researchers as it leads to saving in energy and cost. Because of the rapid increase in energy demand in all over The world, both reducing energy lost related with ineffective use and enhancement of energy in the meaning of heat have become an increasingly significance task for design and operation engineers for many system. A 3 dimensional CFD analysis has been carried out to study heat transfer and fluid flow behavior in a rectangular duct of a solar air heater with one roughened wall having discrete inclined rib roughness. Th

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10

Rouissi, Walid, Nabiha Naili, Mohamed Jarray, and Majdi Hazami. "CFD Numerical Investigation of a New Solar Flat Air-Collector Having Different Obstacles with Various Configurations and Arrangements." Mathematical Problems in Engineering 2021 (September 14, 2021): 1–17. http://dx.doi.org/10.1155/2021/9991808.

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This work deals with a numerical parametric optimization study of a new Solar Flat Air Collector (SFAC) configuration. The CFD numerical parametric study investigates various SFAC structures inside the air cavity without obstacles and with spherical, cubic, cylindrical, and pyramidal obstacles. The study optimizes the most convenient configuration and arrangement that allow for the increase of the heat-transfer surface and to make the flow homogeneous in order to generate turbulence zones inside the SFAC air cavity. The result shows that the thermal performances of the cubic form are close to

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Conference papers on the topic "Relative roughness pitch"

1

Kumar, Amit, Apurba Layek, and Dheeraj Kumar. "Effect of relative roughness pitch on the performance evaluation of a solar air heater roughened with chamfered rib and groove roughness on the surface plate using CFD technique." In PROCEEDINGS OF ADVANCED MATERIAL, ENGINEERING & TECHNOLOGY. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0024246.

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Kameda, Takatsugu, Hideo Osaka, and Shinsuke Mochizuki. "Near-Wall Turbulent Structure for the Boundary Layer Developing Over a K-Type Rough Wall in Low-Reynolds-Number." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45191.

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Measurements of the mean and the turbulent velocities have performed in the vicinity of a roughness element for the turbulent boundary layer developed over a k-type rough wall, which consists of two-dimensional square ribs (10mm × 10mm × 400mm) arrayed with pitch ratio of 4. The Reynolds-number Rθ and k+ based on momentum thickness θ and roughness height k are about 500 and 50 respectively, and relative roughness height k / δ = 0.156. LDV (Laser Doppler Velocitimetry) that it is possible to measure reverse flow was applied to investigate the momentum-exchange process in the open-face (yT = 0(m

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3

Ligrani, Phil, and Jae Sik Jin. "Second Law Analysis of Aerodynamic Losses: Results for a Cambered Vane With and Without Film Cooling." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-70021.

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Results of second law analysis of experimentally-measured aerodynamic losses are presented for a cambered vane with and without film cooling, including comparisons with similar results from a symmetric airfoil. Included are distributions of local entropy creation, as well as mass-averaged magnitudes of global exergy destruction. The axial chord length of the cambered vane is 4.85 cm, the true chord length is 7.27 cm, and the effective pitch is 6.35 cm. Data are presented for three airfoil Mex distributions (including one wherein the flow is transonic), magnitudes of inlet turbulence intensity

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4

Taslim, M. E., L. A. Bondi, and D. M. Kercher. "An Experimental Investigation of Heat Transfer in an Orthogonally Rotating Channel Roughened With 45 Degree Criss-Cross Ribs on Two Opposite Walls." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-332.

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Turbine blade cooling is imperative in advanced aircraft engines. The extremely hot gases that operate within the turbine section require turbine blades to be cooled by a complex cooling circuit. This cooling arrangement increases engine efficiency and ensures blade materials a longer creep life. One principle aspect of the circuit involves serpentine internal cooling passes throughout the core of the blade. Roughening the inside surfaces of these cooling passages with turbulence promoters provides enhanced heat transfer rates from the surface. The purpose of this investigation was to study th

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5

Hata, Koichi, and Suguru Masuzaki. "Subcooled Water Flow Boiling Heat Transfer in a Short SUS304-Tube With Twisted-Tape Insert." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29335.

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The subcooled boiling heat transfer (HT) and the steady-state critical heat fluxes (CHFs) in a short SUS304-tube with twisted-tape insert are systematically measured for mass velocities (G = 4016 to 13850 kg/m2s), inlet liquid temperatures (Tin = 285.82 to 363.96 K), outlet pressures (Pout = 764.76 to 889.02 kPa) and exponentially increasing heat input (Q = Q0exp(t/τ), τ = 8.5 s) by the experimental water loop comprised of a multistage canned-type circulation pump controlled by an inverter. The SUS304 test tube of inner diameter (d = 6 mm), heated length (L = 59.5 mm), effective length (Leff =

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6

Caprio, Leonardo, Simone D’Arcangelo, Davide Chesi, et al. "Laser Hairpin Stripping With a New Generation CO2 Laser at Lower Wavelength for E-Drive Manufacturing." In ASME 2024 19th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/msec2024-126623.

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Abstract Electric drives are conventionally produced with copper hairpin windings. Rather than the flexible winding of thin wires, Cu bars with typically rectangular cross section are separately bent into the desired form and inserted to the stator to form a continuous winding. The open ends to be connected generate the so-called hairpin couples. These regions should be free of the insulating polymer coating in order to apply the successive laser welding operation successfully. The presence of polymeric material in the welded area generates material bursts, spatter, and pores due to the very l

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