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Journal articles on the topic '(ƞ𝑡ℎ); Thermo hydraulic efficiency'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

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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2

Smirnov, V. V., Yu V. Yavorovsky, V. V. Sennikov, and D. O. Romanov. "Comparative analysis of the efficiency of the application of thermal-hydraulic distributor with classical schemes of connecting subscribers." Vestnik IGEU, no. 3 (2019): 5–13. http://dx.doi.org/10.17588/2072-2672.2019.3.005-013.

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Analysis of the use of a thermo-hydraulic distributor in district heating schemes showed insufficient study of the mutual influence of the connected circuits, on which the coefficient of hydraulic stability of the heating network depends, and the lack of a comparative analysis of the efficiency of heat supply when using a scheme with a thermo-hydraulic distributor compared to widely used subscriber connection schemes. The purpose of the study is to compare the economic and energy efficiency of the proposed and existing subscriber connection schemes, which is an important task. In laboratory co

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3

Ferreiro Garcia, Ramon. "Prototyping disruptive self-sufficiency power machines composed by cascaded power units based on thermo-hydraulic actuators." JOURNAL OF ADVANCES IN PHYSICS 22 (September 19, 2024): 212–41. http://dx.doi.org/10.24297/jap.v22i.9662.

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This research focuses on developing a prototype for a disruptive Self-Sustaining Power Machine (SSPM) that consists of cascaded power units (PUs). Each PU integrates thermo-mechanical and thermo-hydraulic actuators to drive hydraulic pumps connected to generators. The prototype's design leverages two thermal cycle types, sVsVs and VsVs, which enable self-sustaining operations by employing several strategic capabilities that challenge the limitations of second-kind perpetual motion machines (PMMs). Therefore, key capabilities include: 1- Performing useful mechanical work through the expansion a

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Khalatov, А. А., І. І. Borisov, G. Kovalenko, and M. Muliarchuk. "APPLICATION OF DIMPLES AND HELICAL GROOVES ON THE OUTTER SURFACE OF TUBES TO INCREASE THERMAL-HYDRAULIC EFFICIENCY OF TUBE BUNDLES AT CROSS FLOW." Thermophysics and Thermal Power Engineering 46, no. 3 (2022): 16–22. http://dx.doi.org/10.31472/ttpe.3.2022.11.

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The flow structure and thermo-hydraulic efficiency of cross flow of tube bundles with dimples and helical grooves have been analyzed. The Reynolds number range (103-104) was typical for industrial heat exсhangers. It was found that dimples and grooves decrease scientifically the cylinder wake area and reduces the hydraulic losses. The heat transfer augmentation in five-row tube bundle by dimples is 35-40% while pressure drop increase by 10-15%. The hydraulic resistance of two-row bundle of tube with helical grooves is 20% lower than that of a smooth tube bundle, while heat transfer augmentatio

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Zahid, Hamid, Abdullah Mubashar, Muhammad Waqas, Muhammad Siddiqi, Umair Munir, and Syed Naqvi. "Experimental and CFD simulation study of shell and tube heat exchangers with different baffle segment configurations." Thermal Science, no. 00 (2022): 75. http://dx.doi.org/10.2298/tsci220124075z.

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Shell and tube heat exchanger (STHX) is an implement that has tremendous applications in numerous industrial processes and research areas. In this study, the commercial software ANSYS is used for 3-D computational fluid dynamics (CFD) to compare the thermo-hydraulic performance of STHXs with recently developed tri-angular (TRI) baffles, and tri-flower (TF) baffles with conventional segmental (SG) baffles at different flow rates. Simulations have been performed to analyze the heat transfer coefficient, pressure drop, and overall thermo-hydraulic performance among the recently developed TRI-STHX

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Ketelsen, Søren, Sebastian Michel, Torben O. Andersen, Morten Kjeld Ebbesen, Jürgen Weber, and Lasse Schmidt. "Thermo-Hydraulic Modelling and Experimental Validation of an Electro-Hydraulic Compact Drive." Energies 14, no. 9 (2021): 2375. http://dx.doi.org/10.3390/en14092375.

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Electro-hydraulic compact drives (ECDs) are an emerging technology for linear actuation in a wide range of applications. Especially within the low power range of 5–10 kW, the plug-and-play capability, good energy efficiency and small space requirements of ECDs render this technology a promising alternative to replace conventional valve-controlled linear drive solutions. In this power range, ECDs generally rely on passive cooling to keep oil and system temperatures within the tolerated range. When expanding the application range to larger power classes, passive cooling may not be sufficient. Re

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V. S. Hans, Sukhmeet Singh, and R. S. Gill. "Thermal and Thermo-hydraulic Performance of Packed Bed Solar Air Heater." Journal of Agricultural Engineering (India) 51, no. 1 (2024): 51–57. http://dx.doi.org/10.52151/jae2014511.1544.

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Modification of flow passage of air in a solar air heater using a packing material is one of available techniques to considerably improve thermal performance of solar air heaters. In an outdoor experimental study, thermal and thermohydraulic performance of a packed bed solar air heater were evaluated and compared with that of a conventional solar air heater. It was observed that due to presence of mild steel chips in the flow passage of air in packed bed solar air heater, its thermal efficiency improved considerably as compared to that of conventional solar air heater for the entire range of R

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Afsahnoudeh, Reza, Andreas Wortmeier, Maik Holzmüller, Yi Gong, Werner Homberg, and Eugeny Y. Kenig. "Thermo-Hydraulic Performance of Pillow-Plate Heat Exchangers with Secondary Structuring: A Numerical Analysis." Energies 16, no. 21 (2023): 7284. http://dx.doi.org/10.3390/en16217284.

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Pillow-plate heat exchangers (PPHEs) represent a suitable alternative to conventional shell-and-tube and plate heat exchangers. The inherent waviness of their channels promotes fluid mixing in the boundary layers and facilitates heat transfer. The overall thermo-hydraulic performance of PPHEs can further be enhanced by applying secondary surface structuring, thus increasing their competitiveness against conventional heat exchangers. In this work, various secondary structures applied on the PPHE surface were studied numerically to explore their potential to enhance near-wall mixing. Computation

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Shafiq, Mehak, Muhammad Farooq, Waqas Javed, George Loumakis, and Don McGlinchey. "Thermo-Hydraulic Performance Analysis of Fe3O4-Water Nanofluid-Based Flat-Plate Solar Collectors." Sustainability 15, no. 6 (2023): 4704. http://dx.doi.org/10.3390/su15064704.

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A cost-effective alternative for lowering carbon emissions from building heating is the use of flat-plate solar collectors (FPSCs). However, low thermal efficiency is a significant barrier to their effective implementation. Favorable nanofluids’ thermophysical properties have the potential to increase FPSCs’ effectiveness. Accordingly, this study evaluates the performance of an FPSC operating with Fe3O4-water nanofluid in terms of its thermo-hydraulic characteristics with operating parameters ranging from 303 to 333 K for the collector inlet temperature, 0.0167 to 0.05 kg/s for the mass flow r

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Azam, Mohammad. "Thermo Hydraulic Analysis of a Heat Pipe Using ANSYS Fluent." International Journal for Research in Applied Science and Engineering Technology 12, no. 8 (2024): 259–66. http://dx.doi.org/10.22214/ijraset.2024.63899.

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Abstract: Miniaturization, Integration of functionality and speed increase are recognized as business drivers in electronics industry today. The aspects increase power dissipation, high temperatures and affects reducing sizes because of limitations in cooling techniques. Heat pipes come handy in these situations as they operate with highest heat conductance compared to any other mode of heat transfer and available over wide range of parameters. It consists of an evaporative section, adiabatic section, and condensing section. The working fluids generally used are water, ethanol, acetone, sodium

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Mai, Yuanqi. "The Effect of Cross-Sectional Shape on the Thermo-Hydraulic Performance of Microchannel Heat Sinks." Applied and Computational Engineering 159, no. 1 (2025): 132–40. https://doi.org/10.54254/2755-2721/2025.23607.

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Microchannel heat sinks are widely used in thermal management systems due to their compact design and efficient heat transfer. To further enhance performance, this study uses numerical simulations to explore the heat transfer characteristics of rectangular, triangular, trapezoidal, and circular microchannels while maintaining equal cross-sectional areas. At Re = 900, the triangular microchannel demonstrates optimal heat transfer performance (HTP) but the weakest hydraulic performance, with a 5.56% reduction in thermal resistance and a 54.45% increase in pumping power compared to the rectangula

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Alam, Tabish, Md Irfanul Haque Siddiqui, Hassan Alshehri, Masood Ashraf Ali, Paolo Blecich, and Kushagra Saurabh. "Exergy-Based Thermo-Hydraulic Performance of Roughened Absorber in Solar Air Heater Duct." Applied Sciences 12, no. 3 (2022): 1696. http://dx.doi.org/10.3390/app12031696.

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This paper presents the thermo-hydraulic performance of small conical ribs on the absorber plate of a solar energy air heater (SAH) using exergy analysis. Application of conical protrusion ribs on the absorber is an attractive solution for enhancing the thermal performance of a SAH. However, these ribs are also responsible for high friction losses and increased fan power consumption caused by the turbulent air flow. To optimize the rib design, it is vital to consider both thermal and hydraulic performance at the same time. The SAH was assessed using an analytic method which predicts the exergy

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Pugi, L., R. Conti, A. Rindi, and S. Rossin. "A Thermo-Hydraulic Tool for Automatic Virtual Hazop Evaluation." Metrology and Measurement Systems 21, no. 4 (2014): 631–48. http://dx.doi.org/10.2478/mms-2014-0055.

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Abstract Development of complex lubrication systems in the Oil&Gas industry has reached high levels of competitiveness in terms of requested performances and reliability. In particular, the use of HazOp (acronym of Hazard and Operability) analysis represents a decisive factor to evaluate safety and reliability of plants. The HazOp analysis is a structured and systematic examination of a planned or existing operation in order to identify and evaluate problems that may represent risks to personnel or equipment. In particular, P&ID schemes (acronym of Piping and Instrument Diagram accordi

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Bhatter, Rahul Kumar, Ali Abbas, and Anant Kumar Rai. "Effect of Baffles Position on Thermo-Hydraulic Efficiency of a Solar Air Heater." IOP Conference Series: Materials Science and Engineering 1132, no. 1 (2021): 012041. http://dx.doi.org/10.1088/1757-899x/1132/1/012041.

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Awis, Nur Amirah, Syed Awais Ali, Mumtahina Mim, Sazratul Nayeem Farabi, and Khairul Habib. "Numerical Heat Transfer Analysis of Evacuated Tube Solar Collector Using MXene/Soyabean Oil Nanofluid." E3S Web of Conferences 488 (2024): 02005. http://dx.doi.org/10.1051/e3sconf/202448802005.

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This study focuses on investigating the thermo-hydraulic performance and entropy generation rate of an evacuated tube solar collector using MXene/Soybean oil as a working nanofluid by means of Computational Fluid Dynamics (CFD). A complete 3-D geometry is considered using three different kinds of working fluids (water, soybean oil and MXene/Soybean oil-0.025 wt.%, 0.075 wt.%, and 0.125 wt.%) for five different mass flow rates (0.02475 kg/s, 0.04818 kg/s, 0.0717 kg/s, 0.0952 kg/s, and 0.1188 kg/s) under same solar radiation (925W/m2). The results revealed that MXene/SO-0.125 wt.% at 0.0717 kg/s

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Borek, Kinga. "Influence of liquid-nitrogen freezing of gas-bearing shale rocks on their compressive strength." Mineralogia 49, no. 1-4 (2018): 7–16. http://dx.doi.org/10.2478/mipo-2018-0002.

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Abstract Any definable relation between falling temperature and the compressive strength of shale rocks should provide a useful predictive tool aiding optimization of the results of hydraulic fracturing. In this research, an automeasuring hydraulic press, a thermo-camera and the Fluent ANSYS software were used. The results of laboratory simulations, and the effects of experiments conducted on shale rocks to determine permanent changes in compressive strength, are presented. As both frozen rocks and rocks returned to room temperature show diminished compressive strength. It is suggested that pr

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Zhou, Aizhao, Xianwen Huang, Wei Wang, Pengming Jiang, and Xinwei Li. "Thermo-Hydraulic Performance of U-Tube Borehole Heat Exchanger with Different Cross-Sections." Sustainability 13, no. 6 (2021): 3255. http://dx.doi.org/10.3390/su13063255.

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For reducing the initial GSHP investment, the heat transfer efficiency of the borehole heat exchange (BHE) system can be enhanced to reduce the number or depth of drilling. This paper proposes a novel and simple BHE design by changing the cross-sectional shape of the U-tube to increase the heat transfer efficiency of BHEs. Specifically, in this study, we (1) verified the reliability of the three-dimensional numerical model based on the thermal response test (TRT) and (2) compared the inlet and outlet temperatures of the different U-tubes at 48 h under the premise of constant leg distance and f

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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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Singh, Niranjan Ramendra, Singh Onkar, and Janakarajan Ramkumar. "Thermo-Hydraulic Performance of Square Micro Pin Fins under Forced Convection." International Journal of Heat and Technology 39, no. 1 (2021): 170–78. http://dx.doi.org/10.18280/ijht.390118.

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Thermal management of the new generation’s high performance electronic and mechanical devices is becoming important due to their miniaturization. Conventionally, the plate fin arrangement is widely used for removal of dissipated heat but, their effectiveness is not up to mark. Among different options, the most attractive and efficient alternative for overcoming this problem is micro pin fin heat sink. This paper presents the experimental investigation of square micro-pin fins heat sink for identifying the most suitable pin fin geometry for heat removal applications under forced convection. Twe

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Shabani Samghabadia, Alireza, Ali Akbar Abbasian Arani, and Hamed Yosofvand. "Thermo-hydraulic efficiency enhancing: Optimized ladder fold baffle structure with cam and circle tube bundle." International Journal of Thermal Sciences 196 (February 2024): 108680. http://dx.doi.org/10.1016/j.ijthermalsci.2023.108680.

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Joshi, Atharva, Rhik Banerjee, Nakul Sreedhar, and Nidhul Kottayat. "A Comparative Study on Cylindrical and Prismatic Lithium-Ion Batteries: Thermo-Hydraulic Performance and Entropy Generation Analysis for Efficient Cooling." CFD Letters 17, no. 11 (2025): 187–203. https://doi.org/10.37934/cfdl.17.11.187203.

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In operating a vehicle powered by electric batteries, thermal management plays a vital role in efficiency and safety. In this numerical study, the thermo-hydraulic performance and entropy generation analysis of cylindrical and prismatic cell battery packs with similar voltage, capacity and discharge specifications are carried out. Three configurations of cylindrical cell battery packs with cells in aligned, staggered and circular configurations are studied for various Reynolds numbers (Re) and the same are compared to the prismatic cell battery pack. The results showed that the prismatic batte

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Vaglio, Emanuele, Federico Scalzo, Marco Sortino, and Luca Casarsa. "Heat Transfer and Pressure Loss Performance of Additively Manufactured Metamaterials in Annular Channels." Energies 18, no. 10 (2025): 2486. https://doi.org/10.3390/en18102486.

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Additive manufacturing is revolutionizing the production of thermo-fluidic devices by enabling the creation of a wide variety of complex architectures, significantly enhancing performance and efficiency. Nevertheless, the range of structural types investigated to date remains limited, with most studies employing simplified methodologies and constrained operating conditions. This study explores the thermo-hydraulic performance of water-cooled annular channels incorporating BCC, Octahedral, and gyroid structures fabricated from AISI 316L stainless steel using Laser Powder Bed Fusion. The samples

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Friedrich, Pascal, Kirill Kuroptev, Thanh Huynh, and Stefan Niessen. "Stability Analysis and Mitigation of Thermo-Hydraulic Oscillations in Multi-Supplier District Heating Systems." Energies 18, no. 5 (2025): 1126. https://doi.org/10.3390/en18051126.

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In fourth-generation district heating systems (DHSs), the supply temperature of modern heat sources such as heat pumps and waste heat can potentially be reduced by mixing in hot water from combustion-based producers, thereby increasing efficiency and facilitating integration into networks with unrenovated buildings. However, this approach introduces the risk of thermo-hydraulic oscillations driven by mixing dynamics, transport delays, and mass flow adjustments by consumers. These oscillations can increase wear and cost and may potentially lead to system failure. This study addresses the asympt

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NIYONZIMA, Jean Bosco, and Patrick Hendrick. "Lab performance testing of a small Banki-Michell hydraulic turbine for remote applications." Journal of Renewable Energies 24, no. 2 (2021): 244–60. http://dx.doi.org/10.54966/jreen.v24i2.984.

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For decades, hydropower has been the most important renewable energy source in the world. The use of Banki-Michell turbine (B-M) in small hydropower constitutes an attractive solution for rural electrification in developing countries and off-grid applications. This robust turbine is easy to design and to construct and not expensive. A test bench (JLA 29) for remote applications was installed at the Aero-Thermo-Mechanics Department of the Brussels Polytechnic School of ULB to test this type of turbine. This paper aimed to present the efficiency results of the installed Banki-Michell turbine tes

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Barreto, Germilly, Paulo Canhoto, and Manuel Collares-Pereira. "Effect of thickness on the thermo-hydraulic performance of porous volumetric solar receivers with different internal geometries." Journal of Physics: Conference Series 2116, no. 1 (2021): 012116. http://dx.doi.org/10.1088/1742-6596/2116/1/012116.

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Abstract In this work, the effect of thickness on the thermal and hydrodynamic performance of porous volumetric solar receivers made of open-cell silicon carbide (SiC) ceramic foam is investigated using an in-house detailed numerical model. The model is based in a Computational Fluid Dynamics (CFD) technique to solve the volume averaged mass, momentum and energy conservation equations, including the exchange of thermal radiation inside the receiver. A Monte Carlo Ray Tracing (MCRT) method was developed and then used to model the solar radiation transport in the porous media. Two optimised inte

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Boonloi, Amnart, and Withada Jedsadaratanachai. "Variations of heat transfer mechanism and flow structure in a heat exchanger tube fitted with 30° inclined ring." Advances in Mechanical Engineering 12, no. 3 (2020): 168781402091148. http://dx.doi.org/10.1177/1687814020911480.

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Flow prediction, heat transfer pattern, and thermo-hydraulic efficiency in a heat exchanger tube fitted with vortex generator are chosen for the present research. The 30° inclined ring is opted to develop the performance of the heat exchanger tube. The effects of inclined ring configuration and placement in the heat exchanger tube on the patterns of flow and heat transfer are investigated. The Reynolds number (at the entry zone of the periodic model) in the range of around 100–2000 (laminar flow region) is discussed. The heat transfer ability, pressure loss, and efficiency of the heat exchange

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Jeong, Soo-Jin, Sang-Jin Lee, and Seong-Joon Moon. "CFD Thermo-Hydraulic Evaluation of a Liquid Hydrogen Storage Tank with Different Insulation Thickness in a Small-Scale Hydrogen Liquefier." Fluids 8, no. 9 (2023): 239. http://dx.doi.org/10.3390/fluids8090239.

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Accurate evaluation of thermo-fluid dynamic characteristics in tanks is critically important for designing liquid hydrogen tanks for small-scale hydrogen liquefiers to minimize heat leakage into the liquid and ullage. Due to the high costs, most future liquid hydrogen storage tank designs will have to rely on predictive computational models for minimizing pressurization and heat leakage. Therefore, in this study, to improve the storage efficiency of a small-scale hydrogen liquefier, a three-dimensional CFD model that can predict the boil-off rate and the thermo-fluid characteristics due to hea

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Singh, Varun Pratap, Siddharth Jain, Ashish Karn, et al. "Mathematical Modeling of Efficiency Evaluation of Double-Pass Parallel Flow Solar Air Heater." Sustainability 14, no. 17 (2022): 10535. http://dx.doi.org/10.3390/su141710535.

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To investigate the influencing range and optimize values of different operational and system parameters on the double-pass parallel flow solar air heater's (DPPFSAH) thermal, effective, and exergetic efficiencies, an iterative method was used to analyze the governing energy equations using a theoretical model written in MATLAB based on the Nusselt number (Nu) and friction factor (f) correlations developed in the work performed earlier. A comparison between double-pass and single-pass SAHs for mathematical and experimental outcomes was conducted, and the results were found to be fairly consiste

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Polansky, Jiri. "Thermodynamics Cycle of Gas-Cooled Fast Reactor." Mechanics and Mechanical Engineering 22, no. 2 (2020): 585–92. http://dx.doi.org/10.2478/mme-2018-0046.

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AbstractThis paper deals with the thermo-hydraulic aspect of gas cooled fast 4 generation reactor. The paper is focused on the comparison of direct and indirect strategy of thermodynamics cycle of helium cooled reactor from the thermodynamics and turbomachinary point of view. The analyses respect pressure looses at all major part of the equipment - reactor, heat exchanger, pipe lines, etc. The compressor and gas turbines efficiency are includes in calculation as well. The working fluid in primary circuit is helium. In the secondary circuit a mixture of helium and nitrogen is considered. The Cy

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Chiavola, Ornella, Edoardo Frattini, Fulvio Palmieri, Ambra Fioravanti, and Pietro Marani. "On the Efficiency of Mobile Hydraulic Power Packs Operating with New and Aged Eco-Friendly Fluids." Energies 16, no. 15 (2023): 5681. http://dx.doi.org/10.3390/en16155681.

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With the increasing environmental awareness, in many applications, ranging from agriculture to industry and logistics, a wider and wider use of eco-friendly fluids is desirable. Although the chemical and biological aspects related to environmental compatibility have been extensively investigated by industries and researchers for obvious environmental reasons, not much literature is available on the performance of hydraulic components and systems operating with eco-friendly fluids, especially on the possible degradation of performance due to fluid aging. This work is aimed at studying the influ

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Singh, Mrityunjay, Saeed Mahmoodpour, Kristian Bär, and Ingo Sass. "Heat Extraction in Geothermal Systems with Variable Thermo-Poroelastic Fracture Apertures." Geotechnics 3, no. 4 (2023): 1196–206. http://dx.doi.org/10.3390/geotechnics3040065.

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The fracture network largely determines the efficiency of heat extraction from fractured geothermal reservoirs. Fracture openings are influenced by thermo-poroelastic stresses during cold fluid flow, with the interplay between fracture length and fracture opening regulating heat transfer. The lack of field data concerning fluctuating fracture openings underscores the necessity for computational models. This work emphasizes the impact of such gaps in the literature. Factors such as temperature, pressure, stress, thermal breakthrough time, and cumulative energy are evaluated to analyze the syste

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Birhanu, Zerihun Kinfe, Nils-Otto Kitterød, Harald E. Krogstad, and Anne Kværnø. "Numerical modeling of aquifer thermal energy efficiency under regional groundwater flow: a case study at Oslo Airport." Hydrology Research 46, no. 5 (2015): 721–34. http://dx.doi.org/10.2166/nh.2015.119.

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The main purpose of this paper is to present a robust forward model for simulating extraction and storage of thermal energy in an aquifer. The model is a local three-dimensional finite element model with boundary conditions derived from an analytic large-scale model based on the regional water balance. Numerical investigations and thermo-hydraulic evaluation of a typical dipole injection/extraction system are presented. Most of the simulation results are focused on the spatio-temporal extension of the hot water plume close to the injection well where the main challenges occur with respect to n

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kumar Goel, Abhishek, S. N. Singh, and B. N. Prasad. "Experimental investigation of thermo-hydraulic efficiency and performance characteristics of an impinging jet-finned type solar air heater." Sustainable Energy Technologies and Assessments 52 (August 2022): 102165. http://dx.doi.org/10.1016/j.seta.2022.102165.

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Andrés, Sandro, David Santillán, Juan Carlos Mosquera, and Luis Cueto-Felgueroso. "Hydraulic Stimulation of Geothermal Reservoirs: Numerical Simulation of Induced Seismicity and Thermal Decline." Water 14, no. 22 (2022): 3697. http://dx.doi.org/10.3390/w14223697.

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Enhanced Geothermal Systems (EGS) can boost sustainable development by providing a green energy supply, although they usually require the hydraulic stimulation of the reservoir to increase fluid flow and energy efficiency due to the low rock permeability at the required depths. The injection of fluids for hydraulic stimulation implies several risks, for instance, induced seismicity. In this work, we perform numerical simulations to evaluate the seismic risk in terms of fault reactivation, earthquake magnitude, and rupture propagation. The computational model includes the fully coupled thermo-h

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Boonloi, Amnart, and Withada Jedsadaratanachai. "Thermo-hydraulic performance improvement, heat transfer, and pressure loss in a channel with sinusoidal-wavy surface." Advances in Mechanical Engineering 11, no. 9 (2019): 168781401987257. http://dx.doi.org/10.1177/1687814019872573.

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Thermal efficiency development in a square channel heat exchanger attached with sinusoidal wavy surface is presented numerically. The affectation of flow attack angles ( α = 30°, 45°, and 60°), flow directions or sinusoidal wavy surface arrangements (V-apex directing downstream named “V-Downstream” and V-apex indicating upstream named “V-Upstream”), and amplitude ratios (blockage ratios = 0.10, 0.15, 0.20, and 0.25) for heat transfer and flow structure are examined for laminar flow regime ( Re = 100–1000). The physical model for the present investigation is validated with the correlation data.

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At-Tasneem Mohd Amin, Wan Azmi Wan Hamzah, and Mohd Azmi Ismail. "Thermo-Hydraulic Performance of Heated Tube with Twisted Delta Winglet Swirler Insert: A Numerical Simulation." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 100, no. 1 (2022): 181–200. http://dx.doi.org/10.37934/arfmts.100.1.181200.

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Among the various methods for enhancing heat transfer in a heat exchanger, a passive method of inserting a continuous swirler inside a heated tube provides a secondary flow along the fluid that reduces the thickness of the thermal boundary layer, thus increasing the efficiency of convection heat transfer performance. The research’s primary goal is to conserve energy, materials, and money by operating efficient heat exchanger equipment. However, the continuous swirler along the fluid flow creates a persistent obstruction, which amplifies the friction factor and increases the working fluid’s ene

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Hassan Venkataramaiah, Harish, Madhusudan Shettykothanuru Vemanna, Palakshaiah Palakshaiah, et al. "Thermo Hydraulic Performance of Double Pipe Heat Exchanger Affected by Triangular and Semi-Circular Protrusion Insert on Twisted Tape." CFD Letters 17, no. 11 (2025): 37–49. https://doi.org/10.37934/cfdl.17.11.3749.

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The experimental studies aimed to enhance the rate of heat transfer by the combined effect of semicircular and triangular protrusions on twisted tape inserts, in a double-pipe heat exchanger over the Reynolds number range of 4000 to 18000. The triangular and semi-circular twisted tape insert features, triangular protrusions along the neutral axis and semicircular edges. The tape insert has 8 mm semicircular protrusions and a triangle protrusion ratio of height and width of 1.1. With x denoting the twist length and B denoting the tape width, the twisted tape has a twist ratio of 4.5. Improvemen

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Abbas, Noor Y., Ali Sabri, and Rand Nabil. "Investigation of Improving Heat Transfer Efficiency using Perforated Fins: A Review." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 132, no. 1 (2025): 22–46. https://doi.org/10.37934/arfmts.132.1.2246.

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Because of their potential to increase accessible area and overall heat diffusion, fins are often used as a thermal control approach for heat exchange. Nevertheless, these surfaces have undergone several modifications to improve their performance, one of which is perforation. Perforation shows outstanding promise in augmenting exchanged heat by enhancing turbulent stream and, most importantly, reducing the mass of these fins. The core goal of this review is to provide an extensive summarisation of the perforation impact as passive approaches that aim to enhance the thermo-hydraulic features of

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Ouabouch, Omar, Imad Ait Laasri, Mounir Kriraa, and Mohamed Lamsaadi. "Modelling and Comparison of the Thermohydraulic Performance with an Economical Evaluation for a Parabolic Trough Solar Collector Using Different Nanofluids." International Journal of Heat and Technology 39, no. 6 (2021): 1763–69. http://dx.doi.org/10.18280/ijht.390609.

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This study examines the three-dimensional heat transfer and flow characteristics of nanofluids in a parabolic trough solar collector under turbulent flow conditions, whereas a non-uniform focused heat flux was applied to the absorption pipe. CuO/water, Al2O3/water, TiO2/water, and SiO2/water are studied numerically. The dynamic and thermal fields are determined by the Reynolds number varying between 50000 ≤ Re ≤ 250000, while the volume concentration of nanofluids is the following: 3% CuO, 6% Al2O3, 4.82% SiO2 and 3.15% TiO2, the nanoparticle size of 30 nm by means of Finite Element Method (FE

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V Sumit Khatri, Naveen Hooda, Narinder Kaushik, and Ravinder Kundu. "Comparison of the Thermohydraulic Efficiency of a Rectangular Fin Tube Heat Exchanger with or without Modified Rectangular Winglet Vortex Generator." Metallurgical and Materials Engineering 31, no. 3 (2025): 404–13. https://doi.org/10.63278/1434.

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Performance Evaluation Criteria (PEC)/ Thermo hydraulic efficiency of a Heat Exchanger may be increased using a Modified Rectangular Winglet Vortex Generator (MRWVG). This Modified rectangular Winglet Vortex Generator is fixed on a rectangular type fin plate and this plate is used to find the Performance Evaluation Criteria with the help of a wind tunnel. The wind tunnel test rig is used for calculating the experimental data with and without a rectangular winglet vortex generator. In this test section first, take a reading on the rectangular plate without the modified rectangular winglet Vorte

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Shang, Lizhi, and Monika Ivantysynova. "Scaling Criteria for Axial Piston Machines Based on Thermo-Elastohydrodynamic Effects in the Tribological Interfaces." Energies 11, no. 11 (2018): 3210. http://dx.doi.org/10.3390/en11113210.

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In lieu of reliable scaling rules, hydraulic pump and motor manufacturers pay a high monetary and temporal price for attempting to expand their production lines by scaling their existing units to other sizes. The challenge is that the lubricating interfaces, which are the key elements in determining the performance of a positive displacement machine, are not easily scalable. This article includes an analysis of the size-dependence of these units with regard to the significant physical phenomena describing the behavior of their three most critical lubricating interfaces. These phenomena include

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Nghana, Barilelo, Fitsum Tariku, and Girma Bitsuamlak. "Numerical Study of the Impact of Transverse Ribs on the Energy Potential of Air-Based BIPV/T Envelope Systems." Energies 16, no. 14 (2023): 5266. http://dx.doi.org/10.3390/en16145266.

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Overheating in BIPV/T applications is a concern due to its negative impacts on the electrical conversion efficiency of the solar cells. Forced air cooling can be an effective thermal management strategy. However, its effectiveness is limited by the thermal resistance associated with the boundary layer formation on the walls of the air channel. The heat transfer effectiveness can be improved by appending transverse ribs to the BIPV/T air channel. This study numerically investigates the energy improvements associated with appending transverse ribs to a BIPV/T air channel using CFD. The impact of

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Shalaginova, Zoya I., and Vyacheslav V. Tokarev. "Development of methods for modeling dynamic thermo-hydraulic conditions for assessing the quality of functioning of heat supply systems." E3S Web of Conferences 219 (2020): 01008. http://dx.doi.org/10.1051/e3sconf/202021901008.

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A simulation dynamic model of thermo-hydraulic conditions of heat supply systems (HSS) is presented. The model makes it possible to analyze in time HSS operating conditions with arbitrary configuration and structure, dissimilar loads of heat consumers, taking into account the transport lag of the coolant, cooling along the length of the pipelines, under different weather conditions, disturbances in the system and a given control scenario in the control nodes. To assess the quality, indicators of the degree of heat supply to consumers are proposed. Formulas are given for determining the total,

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Araújo, António. "Thermo-Hydraulic Performance of Solar Air Collectors with Artificially Roughened Absorbers: A Comparative Review of Semi-Empirical Models." Energies 13, no. 14 (2020): 3536. http://dx.doi.org/10.3390/en13143536.

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Due to the poor thermal characteristics of the air, the absorber roughness of solar air collectors is commonly artificially increased in order to enhance the heat transfer to the air stream. However, this is also accompanied by an undesirable increase in the pumping power due to increased friction losses. As a result, several authors have experimentally investigated several ways of maximizing the heat transfer while minimizing the friction losses of different absorbers, resulting in the development of semi-empirical functions relating the Nusselt number (a measure of heat transfer) and the fri

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Kumar, Raj, Sushil Kumar, Rahul Nadda, Khusmeet Kumar, and Varun Goel. "Thermo-hydraulic efficiency and correlation development of an indoor designed jet impingement solar thermal collector roughened with discrete multi-arc ribs." Renewable Energy 189 (April 2022): 1259–77. http://dx.doi.org/10.1016/j.renene.2022.03.037.

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Nogueira, Elcio. "Thermo-Hydraulic Optimization of Shell and Externally Finned Tubes Heat Exchanger by the Thermal Efficiency Method and Second Law of Thermodynamics." International Journal of Chemical and Process Engineering Research 9, no. 1 (2022): 21–41. http://dx.doi.org/10.18488/65.v9i1.3130.

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The application aims to determine the thermal and hydraulic performance of externally finned, counter-flow, Shell, and Tube Heat Exchangers (STHE). The application refers to the cooling of machine oil flowing in the annular region, including non-spherical cylindrical nanoparticles of Boehmite Alumina. The oil inlet temperature is equal to 80 °C. Sea water is a coolant with an inlet temperature of 20°C. The main parameter in the optimization process is the number of finned tubes used for oil cooling. Another optimization factor is the number of heat exchanger units connected by hairpin. The num

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Wang, Guiqing, Cong Qi, Maoni Liu, Chunyang Li, Yuying Yan, and Lin Liang. "Effect of corrugation pitch on thermo-hydraulic performance of nanofluids in corrugated tubes of heat exchanger system based on exergy efficiency." Energy Conversion and Management 186 (April 2019): 51–65. http://dx.doi.org/10.1016/j.enconman.2019.02.046.

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Jíška, Pavel, and Jan Frýbort. "Proposal of point-wise power reconstruction for IRT-4M fuel assemblies in coupled Monte-Carlo calculations." Acta Polytechnica CTU Proceedings 37 (December 6, 2022): 31–37. http://dx.doi.org/10.14311/app.2022.37.0031.

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Current efforts to develop high-fidelity multi-physics tools for research reactors with IRT-4M fuel leads to the involvement of Monte-Carlo transport and subchannel thermo-hydraulic codes in the process of safety assessment. Monte-Carlo based neutronic codes are often used as a reference tool and are suitable for a prediction of a detailed power distribution. This paper proposes a method of the point-wise power reconstruction based on a Radial Basis Function (RBF) interpolation for complicated irregular geometries and compares different detector functionalities of the Serpent2 code from the ti

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Al-Bakri, Basim A. R., Ali M. Rasham, and Ali O. Al-Sulttani. "Thermal and Thermo-Hydraulic Performance of a Semi-Circular Solar Air Collector Utilizing an Innovative Configuration of Metal Foams." Energies 18, no. 10 (2025): 2501. https://doi.org/10.3390/en18102501.

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The enhancement of the thermal and thermo-hydraulic performance of a semi-circular solar air collector (SCSAC) is numerically investigated using porous semi-circular obstacles made of metal foam with and without longitudinal porous Y-shaped fins. Two 10 and 40 PPI porous material samples are examined. Three-dimensional models are built to simulate the performance of SCSAC: model (I) with clear air passage; model (II) with only metal foam obstacles, and model (III) with metal foam obstacles as well as porous Y-fins. COMSOL Multiphysics software version 6.2 based on finite element methodology is

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Nagrath, Vishwas, Seyed Hunzela Haq, Harshit Mishra, and Adil Wazeer. "Theoretical Study on Methods to Increase the Efficiency and Performance of Solar Air Heater." Asian Review of Mechanical Engineering 9, no. 1 (2020): 1–4. http://dx.doi.org/10.51983/arme-2020.9.1.2477.

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Due to the low thermal performance of solar air heater, different methodologies are adopted to increase its performance namely fins, artificial roughness etc. Thermal performance is obtained for different values of Reynolds number, emissivity of a plate, tilt angle and by employing different kinds of artificial roughness. There are numerous techniques which can be used on the absorber plate to increase the efficiency and Thermo-hydraulic performance of the solar air heater. We can use single roughness geometry or can combine two different roughness geometries also to get best output. By defini

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