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Journal articles on the topic 'Relative roughness pitch'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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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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6

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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9

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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11

Kumar, Raj, Erdem Cuce, Sushil Kumar, et al. "Assessment of the Thermo-Hydraulic Efficiency of an Indoor-Designed Jet Impingement Solar Thermal Collector Roughened with Single Discrete Arc-Shaped Ribs." Sustainability 14, no. 6 (2022): 3527. http://dx.doi.org/10.3390/su14063527.

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This study illustrates the impact of single discrete arc-shaped ribs (SDASR)-type artificial roughness on the performance of a jet impingement solar thermal collector (JISTC). The impact of parametric variations of SDASR on the Nusselt number (Nusdr), friction factor (fsdr), and thermohydraulic performance (ηsdr) is examined. The spacer length (Ssdr) of the SDASR was changed from 0 mm to 300 mm in stages of 100 mm during the experiment. The fixed parameters of the SDASR were a relative discrete distance Dd/Lv of 0.67, relative discrete width gw/Hr of 0.87, relative rib height Hr/H of 0.047, re

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12

Stalin, P. Michael Joseph, R. Lokanadham, Gaddam Naveen, et al. "Innovative cinque rib-roughened stimulators on performance improvement in triangular channel solar air heater." International Journal of Low-Carbon Technologies 19 (2024): 224–32. http://dx.doi.org/10.1093/ijlct/ctae002.

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Abstract Present study investigates application of cinque-faced rib roughening to improve the efficiency of solar air heaters (SAHs). Research focuses on a novel design, the cinque-faced rib-roughened triangular channel SAH (CFRTCSAH), which incorporates five-faced wire ribs on the absorber plate’s underside. By breaking down the laminar sublayer and enhancing flow separation and reattachment, - ribs significantly enhance heat transfer. It establishes a comprehensive theoretical model to analyze the thermal and hydraulic performance of the CFRTCSAH. The study considers the influence of paramet

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13

Amit, Kumar, and Layek Apurba. "Nusselt number and flow distribution analysis over the roughened surface in a rectangular channel of a solar air heater." Journal of India Chemical Society Vol. 97, No. 10b, Oct 2020 (2020): 1959–66. https://doi.org/10.5281/zenodo.5969763.

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National Institute of Technology Durgapur, Durgapur-713 209, West Bengal, India <em>E-mail</em>: amit4310@rediffmail.com <em>Manuscript received online 16 June 2020, revised and accepted 02 September 2020</em> This paper provides the experimental investigation on the latest development of the optical method primarily based on liquid crystals thermography (LCT) method, which is understood to be a vital tool to obtain surface temperature distribution and assessment of heat transfer coefficients of a rectangular channel using artificial rib roughness. The LCT approach makes use of thermo chromic

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14

Kiran Kumar. B et al.,, Kiran Kumar B. et al ,. "Study of Relative Roughness Pitch and Height on Heat Transfer Coefficient of Solar Air Heater with Artificial Roughness." International Journal of Mechanical and Production Engineering Research and Development 8, no. 5 (2018): 409–16. http://dx.doi.org/10.24247/ijmperdoct201846.

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15

Pankaj, Kumar* Dr. S. C. Roy Dr. M. K. Paswan. "EXPERIMENTAL STUDY OF THERMAL PERFORMANCE OF FLAT-PLATE SOLAR AIR HEATER HAVING ROUGHENED (RHOMBUS SHAPE) ABSORBER PLATE." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 9 (2016): 463–70. https://doi.org/10.5281/zenodo.154243.

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An experimental investigation has been carried out for a range of system an operating parameters in order to analyze effect of artificial roughness on thermal performance in flat plate solar air heater having rhombus shape (sheet metal) as roughness geometry. Duct has an aspect ratio W/H of 7, relative pitch (p/e) range of 40 to 60 and Reynolds Number (R<sub>e</sub>) range from to 5100 to 28000. A considerable increase in thermal performance has been observed.

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16

Leonardi, S., P. Orlandi, L. Djenidi, and R. A. Antonia. "Heat transfer in a turbulent channel flow with square bars or circular rods on one wall." Journal of Fluid Mechanics 776 (July 13, 2015): 512–30. http://dx.doi.org/10.1017/jfm.2015.344.

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Direct numerical simulations (DNS) are carried out to study the passive heat transport in a turbulent channel flow with either square bars or circular rods on one wall. Several values of the pitch (${\it\lambda}$) to height ($k$) ratio and two Reynolds numbers are considered. The roughness increases the heat transfer by inducing ejections at the leading edge of the roughness elements. The amounts of heat transfer and mixing depend on the separation between the roughness elements, an increase in heat transfer accompanying an increase in drag. The ratio of non-dimensional heat flux to the non-di

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17

Kumar, R. Rame. "Heat Transfer Analysis of Advanced Solar Collector." Indian Journal of Energy and Energy Resources 1, no. 4 (2022): 1–4. http://dx.doi.org/10.54105/ijeer.d1026.081422.

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A 2-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 circular and square rib roughness. The effect of Reynolds number and relative roughness pitch 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 Investigation has been carried out in medium Reynolds number flow (Re = 3800–18,000). It is found that the thermal

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18

R., Rame Kumar. "Heat Transfer Analysis of Advanced Solar Collector." Indian Journal of Energy and Energy Resources (IJEER) 1, no. 4 (2022): 1–4. https://doi.org/10.54105/ijeer.D1026.081422.

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<strong>Abstract: </strong>A 2-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 circular and square rib roughness. The effect of Reynolds number and relative roughness pitch 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 Investigation has been carried out in medium Reynolds number flow (Re = 3800–18,0

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19

Moraes, Paulo Guimarães de, and Luiz Antonio Alcântara Pereira. "Surface Roughness Effects on Flows Past Two Circular Cylinders in Tandem Arrangement at Co-Shedding Regime." Energies 14, no. 24 (2021): 8237. http://dx.doi.org/10.3390/en14248237.

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This paper contributes by investigating surface roughness effects on temporal history of aerodynamic loads and vortex shedding frequency of two circular cylinders in tandem arrangement. The pair of cylinders is immovable; of equal outer diameter, D; and its geometry is defined by the dimensionless center-to-center pitch ratio, L/D. Thus, a distance of L/D = 4.5 is chosen to characterize the co-shedding regime, where the two shear layers of opposite signals, originated from each cylinder surface, interact generating counter-rotating vortical structures. A subcritical Reynolds number of Re = 6.5

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20

Yadav, Anil Singh, Tabish Alam, Gaurav Gupta, et al. "A Numerical Investigation of an Artificially Roughened Solar Air Heater." Energies 15, no. 21 (2022): 8045. http://dx.doi.org/10.3390/en15218045.

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Solar air heating devices have been employed in a wide range of industrial and home applications for solar energy conversion and recovery. It is a useful technique for increasing the rate of heat transfer by artificially creating repetitive roughness on the absorbing surface in the form of semicircular ribs. A thermo-hydraulic performance analysis for a fully developed turbulent flow through rib-roughened solar air heater (SAH) is presented in this article by employing computational fluid dynamics. Both 2-dimensional geometrical modeling and numerical solutions were performed in the finite vol

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21

Kumar, Khushmeet, Sushil Kumar, Deoraj Prajapati, Sushant Samir, Sashank Thapa, and Raj Kumar. "Solar Thermal Collector Roughened with S-Shaped Ribs: Parametric Optimization Using AHP-MABAC Technique." Fluids 10, no. 3 (2025): 67. https://doi.org/10.3390/fluids10030067.

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The current examination used a multi-criteria decision-making (MCDM) approach to optimize the roughness parameters of S-shaped ribs (SSRs) in a solar thermal collector (STC) duct using air as the working fluid. Different SSRs were tested to identify the combination of parameters resulting in the best performance. Geometrical parameters such as relative roughness pitch (PR/eRH) varied from 4 to 12, relative roughness height (eRH/Dhd) from 0.022 to 0.054, arc angle (αArc) from 30° to 75°, and relative roughness width (WDuct/wRS) from 1 to 4. The Nusselt number (NuRP) and friction factor (fRP), f

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22

Sumit, Kumar*1 and Dr. Manikant Paswan2. "COMPUTATIONAL INVESTIGATION OF THERMAL PERFORMANCE OF SOLAR AIR HEATER HAVING ROUGHNESS ELEMENTS AS TRANSVERSE WIRE ON THE TWO SIDE ABSORBER PLATE." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 7, no. 2 (2018): 664–74. https://doi.org/10.5281/zenodo.1184046.

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An Analytical investigation has been carried out to study the heat transfer and friction characteristics by using a transverse wire on the absorber plate of a solar air heater. The Analytical investigation consist the Reynolds number (Re) ranges from 3000 to 14 000, relative roughness pitch (p/e) 10–30 and relative roughness height (e/D) 0.0135-0.0225. The effect of these parameters on the heat transfer coefficient and friction factor has been discussed in the present paper and correlations for Nusselt number and friction factor has been developed within above limits. A procedure to comp

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23

Khimsuriya, Yogeshkumar D., D. K. Patel, Vivek Patel, Hitesh Panchal, and Lav Kumar Kaushik. "Experimental study of the thermal efficiency of Solar air heater equipped with rotating spiral shape baffles: Using Solar Simulator." Journal of Physics: Conference Series 2818, no. 1 (2024): 012022. http://dx.doi.org/10.1088/1742-6596/2818/1/012022.

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Abstract This study investigates the thermal performance of a Solar Air Heater (SAH) equipped with rotating spiral-shaped baffles, utilizing a solar simulator. Parameters such as relative roughness pitch (P/e) and Reynolds number (Re) were varied within the ranges of 4-10 and 4000-12000, respectively, with a fixed relative roughness height (e/H) of 0.8. The fabricated solar simulator, adhering to EN-12975-2 standards, demonstrated excellent irradiance homogeneity at approximately 10.47%, resulting in an average solar irradiance of 955 W/m2. The introduction of artificial roughness on the absor

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24

Zhang, Zeng, and S. Samuel Li. "Large Eddy Simulation of Near-Bed Flow and Turbulence over Roughness Elements in the Shallow Open-Channel." Water 12, no. 10 (2020): 2701. http://dx.doi.org/10.3390/w12102701.

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Turbulent flows in rough open-channels have complex structures near the channel-bed. The near-bed flow can cause bed erosion, channel instability, and damages to fish habitats. This paper aims to improve our understanding of the structures. Transverse square bars placed at the channel-bed form two-dimensional roughness elements. Turbulent flows over the bars are predicted using large eddy simulation (LES). The predicted flow quantities compare well with experimental data. The LES model predicts mean-flow velocity profiles that resemble those in the classic turbulent boundary layer over a flat

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Alaskari, Mustafa, Arwa M. Kadhim, Ammar A. Farhan, Moustafa Al-Damook, and Mansour Al Qubeissi. "Performance Evaluation of Roughened Solar Air Heaters for Stretched Parameters." Clean Technologies 4, no. 2 (2022): 555–69. http://dx.doi.org/10.3390/cleantechnol4020034.

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Artificial roughness applied to a Solar Air Heater (SAH) absorber plate is a popular technique for increasing its total thermal efficiency (ηt−th). In this paper, the influence of geometrical parameters of V-down ribs attached below the corrugated absorbing plate of a SAH on the ηt−th was examined. The impacts of key roughness parameters, including relative pitch p/e (6–12), relative height e/D (0.019–0.043), angles of attack α (30–75°), and Re (1000–20,000), were examined under real weather conditions. The SAH ηt−th roughened by V-down ribs was predicted using an in-house developed conjugate

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Singh, Sukhmeet, Subhash Chander, and J. S. Saini. "Thermo-hydraulic performance due to relative roughness pitch in V-down rib with gap in solar air heater duct—Comparison with similar rib roughness geometries." Renewable and Sustainable Energy Reviews 43 (March 2015): 1159–66. http://dx.doi.org/10.1016/j.rser.2014.11.087.

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Alam, Tabish, Chandan Swaroop Meena, Nagesh Babu Balam, Ashok Kumar, and Raffaello Cozzolino. "Thermo-Hydraulic Performance Characteristics and Optimization of Protrusion Rib Roughness in Solar Air Heater." Energies 14, no. 11 (2021): 3159. http://dx.doi.org/10.3390/en14113159.

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To enhance the thermal performance of solar air heaters (SAHs), protrusion ribs on the absorber are considered to be an attractive solution due to their several advantages. These ribs do not cause a significant pressure drop in the SAH duct and help to enhance the heat transfer to flowing air. On the other hand, a degree of roughness of the protrusion rib on the absorber can be produced by pressing the indenting device without adding additional mass. In this paper, the thermo-hydraulic performances of different roughnesses of the conical protrusion rib on the absorber plate have been evaluated

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Hashim, Yousif. "Heat transfer and fluid flow inside duct with using fan-shape ribs." Journal of Applied Engineering Science 19, no. 2 (2021): 526–32. http://dx.doi.org/10.5937/jaes0-28398.

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A 2-D computational analysis is carried out to calculate heat transfer and friction factor for laminar flow through rectangular duct with using fan-shape ribs as a turbulator. The types of rib shapes are imported on the heat transfer rate and fluid flow in heat exchangers. The present study makes use of a fan-shaped ribs with two arrangements. The first arrangement was downstream fan-shape ribs (case 1) and upstream fan-shape ribs (case 2) is investigated. A commercial finite volume package ANSYS FLUENT 16.1 are used for solving the meshing process with continuity, momentum and energy equation

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Kamali, R., and A. R. Binesh. "Heat Transfer and Friction Characteristics Optimization with Compound Turbulators in Roughened Ducts." Journal of Mechanics 25, no. 3 (2009): 271–78. http://dx.doi.org/10.1017/s1727719100002720.

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AbstractThe use of artificial roughness or turbulence promoters on a surface is an effective technique to enhance the rate of heat transfer of the fluid flowing in a duct. In this study, a computer code has been developed to perform a numerical simulation for optimizing the shape of two-dimensional channel with periodic ribs mounted on the bottom wall to enhance turbulent heat transfer. The Reynolds-Averaged Navier-Stokes analysis is used as a numerical technique and the SST k-(ω) turbulent model with near-wall treatment as a turbulent model. The simulations were performed for two rib shapes,

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Dhagat, Animesh, and M. S. Manjunath. "Augmentation of Effective Thermal Gain of Solar Air Heater using a Novel Turbulator Design- A CFD Study." MATEC Web of Conferences 144 (2018): 04015. http://dx.doi.org/10.1051/matecconf/201814404015.

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Augmentation of thermal performance of solar air heater has been the focus of many researchers over the last decades and the use of turbulator or artificial roughness to provide increased fluid mixing in order to achieve augmented heat transfer has been a widely accepted technique. This work aims to evaluate the effect of a novel turbulator design on the effective thermal performance of solar air heater using the methodology of computational fluid dynamics (CFD). A two dimensional CFD analysis is carried out to evaluate the thermal characteristics of solar air heater at various flow Reynolds n

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Gawande, Vipin B., A. S. Dhoble, and D. B. Zodpe. "CFD Analysis to Study Effect of Circular Vortex Generator Placed in Inlet Section to Investigate Heat Transfer Aspects of Solar Air Heater." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/567257.

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CFD analysis of 2-dimensional artificially roughened solar air heater duct with additional circular vortex generator, inserted in inlet section is carried out. Circular transverse ribs on the absorber plate are placed as usual. The analysis is done to investigate the effect of inserting additional vortex generator on the heat transfer and flow friction characteristics inside the solar air heater duct. This investigation covers relative roughness pitch in the range of 10 ≤P/e≤ 25 and relevant Reynolds numbers in the range of 3800 ≤ Re ≤ 18000. Relative roughness height (e/D) is kept constant as

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Om, Prakash Srivastava1 K. K. Jain2 Shailesh Gupta3*. "EFFECT OF RIB ATTACK ANGLE ON HEAT TRANSFER AND FRICTION FACTOR IN A SQUARE CHANNEL ROUGHENED BY V SHAPED RIBS WITH A GAP." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 12 (2017): 236–44. https://doi.org/10.5281/zenodo.1116631.

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An experimental study was carried out to investigate the effect of angle of attack on forced convection heat transfer and friction factor of an artificially roughened duct. The test section of the square duct (<em>AR</em>=1) was roughened on its top and bottom wall with  V shaped square ribs having a gap on its length. The ratio of the width to height of the duct (<em>W/H</em>) was 1, the relative roughness height (<em>e/D</em><sub>h</sub>) was 0.060, relative roughness pitch (<em>p/e</em>) was 10, relative gap width (<em>g/e</em>) was 1and relative gap position (<em>d/W</em>) was taken a

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Theeb, Ali H., and Munther A. Mussa. "Numerical investigation on heat transfer enhancement and turbulent flow characteristics in a high aspect ratio rectangular duct roughened by intersecting ribs with inclined ribs." Journal of Engineering 26, no. 5 (2020): 20–37. http://dx.doi.org/10.31026/j.eng.2020.05.02.

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In this study, the effect of intersecting ribs with inclined ribs on the heat transfer and flow characteristics of a high aspect ratio duct has been numerically investigated. The Relative roughness pitch (P/e) is 10 and the Reynolds number range from 35,700 to 72,800. ANSYS (Fluent-Workbench 18.0) software has been utilized to solve the Reynolds averaged Navier-Stokes (RANS) equations with the Standard k-ε turbulence model. Three ribbed models have been used in this study. Model 1 which is a just inclined ribs, Model 2 which has a single longitudinal rib at the center with inclined ribs and Mo

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Dr., Ashwini Kumar*. "A REVIEW REPORT FOR HEAT TRANSFER AND FLUID FLOW CHARECTRISTICS." Global Journal of Engineering Science and Research Management 4, no. 10 (2017): 98–120. https://doi.org/10.5281/zenodo.1034495.

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Solar air heaters are one of the simplest and cost effective solar energy utilization systems for various drying applications. The thermal efficiency of solar air heaters is found to be low due to low heat transfer coefficient on the air side. Attempts have been made to enhance the heat transfer rate from the absorber plate to air by using different roughness elements. Enhancement of heat transfer coefficient is achieved by providing artificial roughness, always goes with an increment of pressure drop and more pumping power is required. So, there is a need to optimize the system parameters to

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Kant, Chander, Prashant Kumar, Ankur Gill, and Dhiraj Parkash Dhiman. "Thermal Performance of Three Sided Artificially Roughened Double Duct Parallel Flow Solar Air Heater." Asian Journal of Engineering and Applied Technology 7, no. 1 (2018): 5–15. http://dx.doi.org/10.51983/ajeat-2018.7.1.976.

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A solar air heater is basically a heat exchanger, which intercepts the incident solar radiation, converts it into heat and finally transfers this heat to a working fluid for an end use system. The mode of air flowing in the ducts of a solar air heater is one of the most significant aspects concerned with solar air heater which dominantly affect. A double duct parallel flow artificially roughened solar air heater with three sides of the absorber plate is investigated in the current study. Unlike the conventional model of solar air heater with only one sided roughened absorber plate, a novel sol

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Ayalew, Yewondwosen Gzate. "Experimental Investigation of Heat and Fluid Flow Characteristics on Expanded Metal Mesh Roughened Solar Collector." Trends in Sciences 19, no. 22 (2022): 6326. http://dx.doi.org/10.48048/tis.2022.6326.

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Solar air heater is used for agricultural grain products drier, curing of industrial products and for other systems requiring low grade thermal energy. Their usefulness and quantitative energy collections has been limited. This is because of low thermal efficiency with primarily as a result of low convective heat transfer coefficient, between the absorber plate and air leading to higher plate temperature. This results greater thermal energy losses. Experimental investigation has been conducted to study heat transfer enhancement by using small diameter wire ribs on absorber plate of solar air h

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Babaei-Ghazvini, Amin, and Bishnu Acharya. "Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol." Polymers 13, no. 21 (2021): 3695. http://dx.doi.org/10.3390/polym13213695.

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It has been extensively reported that cellulose nanocrystals (CNCs) can represent structural colors due to their unique chiral-nematic self-assembly. However, the application of this remarkable structure does need further investigation. It has been challenging to keep the selective reflection band (SRB) resulting from the CNC structure in the visible spectrum. Herein, composition of CNC colloidal suspensions with polyethylene glycol (PEG) and glycerol (Gly) have been studied to develop humidity-responsive sensors in the form of coatings and films. The fabricated samples were characterized for

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Kumar, Dheeraj, and Apurba Layek. "Experimental Assessment of Thermohydraulic Performance of a Rectangular Solar Air Heater Duct Using Twisted V-Shaped Staggered Ribs." Journal of Thermal Science and Engineering Applications, February 8, 2023, 1–20. http://dx.doi.org/10.1115/1.4056878.

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Abstract The present experimental work is dedicated to find out the thermohydraulic performance of rectangular solar air heater duct effect of utilizing rib elements as twisted V-shaped staggered ribs over the absorber plate. The performance test is executed with varying the roughness parameters named as a relative roughness pitch (P/e) ranging from 7-11, relative staggered distance (d/e) of 2-6, and relative roughness length (S/e) of 4.39-10.26, and flow Reynolds number varied from 3000-21000. The liquid crystal thermography technique is employed to view the dispersal of the Nusselt number ov

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"Performance Evaluation of Solar Collector Having Broken Arc Ribs Of Symmetrical Gap with Staggered Elements." International Journal of Engineering and Advanced Technology 9, no. 1 (2019): 7611–15. http://dx.doi.org/10.35940/ijeat.f9317.109119.

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To experimentally investigate the thermal behaviour of solar collector with broken arc artificial roughness of symmetrical gap and staggered element, a study is conducted with four number of absorber surface of hot rolled steel plate of dimensions 1500 mm x210 mm x1.2 mm (length x width x thickness). The test dimension of plate was 1500 mm x 200 mm (LxW). The test parameters were relative roughness pitch P/e as 8-14, relative roughness height e/Dh as 0.04545, number of gaps Ng as 2, relative gap width g/e as 1, relative staggered length r/e as 4.5, relative staggered pitch p’/p as 0.4 and Reyn

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Singh, Jitendra, and Atul Lanjewar. "Thermal performance of solar air heater having discrete symmetrical arc rib with staggered rib roughness." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, May 15, 2023, 095440622311707. http://dx.doi.org/10.1177/09544062231170706.

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This paper investigates physics of forced flow underneath the absorber plate in solar air heater (SAH) integrated with new arc geometry namely discrete symmetrical arc rib with staggered rib roughness. This article signifies the impact of roughness pitch relative to rib height (p/e) on the thermal performance of rectangular roughened SAH duct having discrete symmetrical arc rib with staggered rib (present study). Novel arc rib geometry (present study) is achieved by providing an additional gap in a significantly long continuous arc segment of existing best arc rib geometry to break the boundar

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-, Kalpana, L. Varshney, and sudhakar subudhi. "Heat transfer and pressure drop in a double pass solar air heater with arc shaped artificial roughness." Journal of Solar Energy Engineering, April 21, 2022, 1–37. http://dx.doi.org/10.1115/1.4054397.

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Abstract An experimental and theoretical study has been performed to analyze the heat transfer and pressure drop performance of a double pass solar air heater having arc shaped roughness. The investigations are performed for the Re ranging from 3000-12000, relative roughness pitch (p/e) ranging from 8-12, relative roughness height (e/d) of 0.0433 and the angle of attack (a/90) of 0.3333. The investigation has covered different performance parameters such as Nu, friction factor and thermal performance factor of rough and smooth double pass solar air heater. The significant enhancement is observ

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Kumar, Amit, and Apurba Layek. "Heat Transfer Measurement in a Rectangular Channel of Solar Air Heater With Winglet-Type Ribs Using Liquid Crystal Thermography." Journal of Thermal Science and Engineering Applications 14, no. 4 (2021). http://dx.doi.org/10.1115/1.4051692.

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Abstract This paper deals with the study of heat transfer in solar air heater consisting of winglet-shaped roughness on the absorber plate using liquid crystal thermography technique. The winglet-type roughness element was placed on the absorber surface of a rectangular channel solar air heater having an aspect ratio of 4. The absorber surface was heated uniformly by a constant heat flux of 800 W/m2. The non-dimensional roughness parameter considered was relative roughness pitch, i.e., P/e, and its values range between 5 and 12 with Reynolds number (Re) ranges between 6500 and 22,000. The valu

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Ali, Subhan, and Vipin Uniyal. "Performance Enhancement of Solar Photovoltaic Thermal Energy Collection (PV/T) System with W-Shaped Rib Rouhgness." Journal of Graphic Era University, March 7, 2023. http://dx.doi.org/10.13052/jgeu0975-1416.1116.

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The purpose of this study is to investigate the possibility of improving electrical (cell) efficiency, thermal efficiency, and overall performance by adding w-rib roughness to the bottom of the absorber plate. the bottom of the absorber plate being given w-rib roughness. Based on a mathematical simulation of the PV/T system as a function of pertinent geometrical parameters, such as relative roughness pitch, relative roughness height, and angle of attack, as well as design parameters, such as temperature rise and insolation, the performance parameters—enhancement of electrical efficiency, therm

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Kumar, Dheeraj, and Apurba Layek. "Heat Transfer Augmentation of a Solar Air Heater Using a Twisted V-Shaped Staggered Rib Over the Absorber Plate." Journal of Solar Energy Engineering, August 29, 2022, 1–16. http://dx.doi.org/10.1115/1.4055404.

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Abstract An effort is made to study the performance of a solar air heater having the absorber surface roughened by providing staggered, twisted V-shaped ribs roughness. Liquid crystal thermography technique is applied to get the Nu distribution over the surface. Experimentation is done for Reynolds number ranges from 3000 to 21000, relative roughness to pitch ratio (P/e) from 7 to 11 and relative staggered distance (d/e) of 2 to 6, for fixed angle of attack (a), relative twist length (y/e), relative roughness length (S/e). It is found that maximum Nusselt number and friction factor augmentatio

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Varun. "Heat Transfer and Friction Factor Study for Triangular Duct Solar Air Heater Having Discrete V-Shaped Ribs." February 1, 2015. https://doi.org/10.5281/zenodo.1099434.

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Solar energy is a good option among renewable energy resources due to its easy availability and abundance. The simplest and most efficient way to utilize solar energy is to convert it into thermal energy and this can be done with the help of solar collectors. The thermal performance of such collectors is poor due to less heat transfer from the collector surface to air. In this work, experimental investigations of single pass solar air heater having triangular duct and provided with roughness element on the underside of the absorber plate. V-shaped ribs are used for investigation having three d

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Varun. "Heat Transfer and Friction Factor Study for Triangular Duct Solar Air Heater Having Discrete V-Shaped Ribs." International Journal of Mechanical, Industrial and Aerospace Sciences 8.0, no. 3 (2015). https://doi.org/10.5281/zenodo.1338116.

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Solar energy is a good option among renewable energy resources due to its easy availability and abundance. The simplest and most efficient way to utilize solar energy is to convert it into thermal energy and this can be done with the help of solar collectors. The thermal performance of such collectors is poor due to less heat transfer from the collector surface to air. In this work, experimental investigations of single pass solar air heater having triangular duct and provided with roughness element on the underside of the absorber plate. V-shaped ribs are used for investigation having three d

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Al‐Chlaihawi, Kadhim, Bahjat Hassan Alyas, and Banan Najim Abdullah. "Optimizing of heat transfer and flow characteristics within a roughened solar air heater duct with compound turbulators." Asia-Pacific Journal of Chemical Engineering, July 23, 2024. http://dx.doi.org/10.1002/apj.3126.

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AbstractThermal systems for solar air heating have been widely used in both industrial and residential contexts, and are essential for converting and recovering solar energy. Thermal performance in solar air heaters (SAHs) can be improved through the repetitive application of artificial roughness to the surfaces. This research work includes a numerical evaluation of SAH performance with artificial rough surfaces made up of combined transverse trapezoidal ribs and chamfered grooves. The ANSYS Fluent software version 2023 R1 was used to simulate SAH with varying relative roughness pitch (), rela

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"Thermo-Hydraulic Performance of a Rectangular Duct With Staggered Inclined Discrete Rib Arrangement." International Journal of Innovative Technology and Exploring Engineering 9, no. 1 (2019): 1654–58. http://dx.doi.org/10.35940/ijitee.a4697.119119.

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Artificial roughness in the form of ribs is a beneficial strategy to improve the thermal performance of solar air heaters (SAHs). In the present research work, experimental examinations have been conducted on heat transfer and friction characteristics in the rectangular channel, which is roughened through the inclined discrete ribs. The inclined ribs were discretized by creating gaps at the different positions (not inline) on trailing and leading edges in consecutive ribs The rib roughness has relative roughness pitch as 8.0, rib combination of relative gap position is varied from 0.3 & 0.

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Lin, Ting-Yu, and Satish G. Kandlikar. "An Experimental Investigation of Structured Roughness Effect on Heat Transfer During Single-Phase Liquid Flow at Microscale." Journal of Heat Transfer 134, no. 10 (2012). http://dx.doi.org/10.1115/1.4006844.

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The effect of structured roughness on the heat transfer of water flowing through minichannels was experimentally investigated in this study. The test channels were formed by two 12.7 mm wide × 94.6 mm long stainless steel strips. Eight structured roughness elements were generated using a wire electrical discharge machining (EDM) process as lateral grooves of sinusoidal profile on the channel walls. The height of the roughness structures ranged from 18 μm to 96 μm, and the pitch was varied from 250 μm to 400 μm. The hydraulic diameter of the rectangular flow channels ranged from 0.71 mm to 1.87

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Jain, Piyush Kumar, Prem Kumar Chaurasiya, Upendra Rajak, Tikendra Nath Verma, and Damodar Tiwari. "Application of artificial intelligence to investigate the performance and flow pattern near staggered piece in V-ribs with aligned gaps roughness in solar air heater using relevant input parameters." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, January 23, 2024. http://dx.doi.org/10.1177/09544089231223032.

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The present work findings of an experimental investigation on a rectangular duct used in a solar air heater (SAH) to increase heat transfer and frictional characteristics and improve flow near the roughness. The rough SAH surface is created by staggered V-ribs and aligned gaps. For Reynolds numbers 3000–14,000, relative gap breadth (g/e) is changed from 2 to 5, while other parameters are maintained constant: relative roughness pitch (P/e) = 10, relative staggered rib position (P'/P) = 0.4, relative staggered rib size (w/g) = 1, and relative roughness height (e/Dh) = 0.0434. The Nusselt number

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