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82 articles for “Heat transfer coefficients”
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Modeling and Simulation of Spiral Plate Heat Exchanger
Abstract: The spiral-plate heat exchanger (SHE) offers efficiency in spacing and reduces heat losses. SHE’s offer high reliability, lower spaces occupancy, high heat transfer coefficient and on-line performance in many severely fouling services such as slurries. Experimental investigations were conducted in a spiral plate heat exchanger with hot water as the service fluid and cold water in different flow rates as the cold process fluid. The experiments were conducted essentially in …
Published in Journal of Thermal Engineering and Applications · Vol. 1, Issue 1, 2014 · pp. 22–29 Read article
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Experimental Analysis of Concentric Heat Exchanger with Dimpled Tube
Abstract: In this work, an experimental and CFD analysis of concentric heat exchangers with smooth andspherical dimple pipes in different mass streams with water as a working medium is presented.Heat transfer technology refers to various methods used to increase the heat transfer ratewithout significantly affecting the overall system performance. Over the past decade, severalstudies have reported indirect technology for heat transfer. The present study on the change ofthe inner tube to …
Published in Journal of Thermal Engineering and Applications · Vol. 7, Issue 3, 2020 · pp. 7–12 Read article
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The Effect of Sonication Time on Alumina Nanofluids with Paradoxical Behavior
Abstract: Nanofluids can be considered to be the next-generation heat transfer fluids as they offer exciting new possibilities to enhance heat transfer performance compared to pure liquids. Heat transfer enhancement using nanofluids have been reported in literature pertinent to thermal conductivity under the static conditions, convective heat transfer and phase change heat transfer. Except for the studies from the first category where the nanofluids exhibited much higher thermal conductivities than those …
Published in Nano Trends – A Journal of Nano Technology & Its Applications · Vol. 16, Issue 3, 2014 · pp. 31–40 Read article
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Review Paper on Experimental Investigation of the Impingement Cooling for Single Stationary Flat Plate in Case of Laminar Flow
Abstract: In this paper, impingement cooling on single stationary flat stainless steel plate in which we illustrate the effects of cooling rate, heat transfer rate, and heat transfer coefficient of plate when jet hole diameter changes from 5 to 8 mm; it means that there are changes in Re and Nu number and corresponding changes in air velocity. Select the jet to target plate distance as 9D, where D=diameter of the …
Published in Recent Trends in Fluid Mechanics · Vol. 3, Issue 2, 2016 · pp. 36–43 Read article
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The Impingement Cooling for Single Stationary Flat Plate in Case of Laminar Flow
Abstract: In this paper, impingement cooling on single stationary flat stainless steel plate is performed to illustrate the effects of cooling rate, heat transfer rate, heat transfer coefficient of the plate when the jet hole diameter is changed from 5 to 8 mm. It means that changes in Reynolds number (Re) and Nusselt number (Nu) show corresponding changes in air velocity. Select the jet to target plate distance nine times diameter …
Published in Recent Trends in Fluid Mechanics · Vol. 3, Issue 2, 2016 · pp. 44–52 Read article
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CFD Analysis of Six-Flow Microchannel Heat Sink Using the Different Nanofluid
Abstract: In this study, we compare the heat-conveying capabilities of ordinary water with those of cooling fluids such as Ag-Water, TiO2-water, and Al2O3-water nanofluid at a volume percentage of 0.50%, and we also examine the six flow micro-channels of the fin-equipped heat sink. Hardware like microprocessors and integrated circuits are not used in the comparison. To evaluate the effectiveness of different cooling fluids, a number of thermal metrics are used, such …
Published in Journal of Polymer & Composites · Vol. 11, Issue 11, 2023 · pp. 1–11 Read article
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Parametric Analysis on Pulsating Heat Pipes
Abstract: Day-by-day the size of the electronic components is being drastically decreased, but at the same time the computing capacities are improved manifold. This presents a new challenge in the thermal management of these components. Pulsating Heat Pipes (PHP) can transport warmth for considerable distances leading to placement of condenser away from compact cabinets. From the literature, it is observed that Acetone, Ethanol and Distilled water are the most widely used …
Published in Recent Trends in Fluid Mechanics · Vol. 4, Issue 1, 2017 · pp. 38–43 Read article
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Investigation of Heat Transfer for Extruded Polymers Cooled in Water
Abstract: The commodity articles from polyethylene (PE) and polypropylene (PP) are widely used in today’s world. To reduce the carbon footprint, biopolymers such as polylactic acid (PLA) as commodity plastics are also explored. Often, these polymers have to be extruded before they are fabricated for end users. The work described in this paper has been divided in two parts. In the first part PE, PP and PLA are subjected to extrusion …
Published in Journal of Modern Chemistry & Chemical Technology · Vol. 6, Issue 3, 2015 · pp. 17–23 Read article
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Numerical Simulations of Heat transfer in Microchannels for Cooling in Microsystems
Abstract: Fluid flow at microscale is being studied extensively in recent years. Understanding the heat transfer characteristics and fluid flow at these scales has relevance to electronics cooling, microheat exchangers, microelectro mechanical systems (MEMS) devices amongst others. In this investigation, three-dimensional models of microchannels with different geometrical cross-sections have been numerically simulated using the CFD software tool FLUENT. The numerical data obtained from this work provides better understanding and insight into …
Published in Recent Trends in Fluid Mechanics · Vol. 2, Issue 1, 2015 · pp. 15–20 Read article
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Enhancement in Heat Transfer Rate in a Pipe in Pipe Heat Exchanger Using Helical Insert
Abstract: AbstractHeat transfer enhancement techniques are frequently used in heat exchanger system in order to increase the rate of heat transfer and improve the thermal performance of the system. This paper contains experimental study on enhancement in heat transfer rate using helical insert. The inner tube used was of copper with inner and outer diameter of 11.8 mm and 12.7 mm, respectively, and outer tube was galvanized iron, which was insulated …
Published in Journal of Thermal Engineering and Applications · Vol. 5, Issue 2, 2018 · pp. 5–12 Read article
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Numerical Investigations of Fluid Flow and Heat Transfer in a Ribbed Heated Duct with Variable Aspect Ratios
Abstract: The present investigation has been carried out to investigate the steady-state forced convection heat transfer and pressure drop characteristics of turbulent flow in an air cooled horizontal duct. The aspect ratio (W/H, where W is width and H is the height of the duct) is varied in the range of 1 to 4. Square ribs are fixed on the inner side of the bottom wall which is heated with constant …
Published in Recent Trends in Fluid Mechanics · Vol. 3, Issue 1, 2016 · pp. 27–37 Read article
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Numerical Study on Heat Transfer Enhancement of Laminar Flow through a Circular Tube with Artificial Rib Roughness
Abstract: This work presents the configuration optimization of a typical square roughness in a circular tube for laminar heat transfer in air using computational fluid dynamics (CFD) modelling. Conjugate heat transfer 2D numerical model has been developed and successfully carried out. CFD numerical simulations were carried out to analyze the flow and heat transfer in the air duct of a solar air heater provided with rectangular ribs. The laminar flow model …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 1, Issue 3, 2014 · pp. 14–19 Read article
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Enhancing Cooling Efficiency in Dual Nozzle CO2-Based Vortex Tube Systems for Machining Titanium Alloys: Implications for Polymer and Composite Processing
Abstract: In machining of Titanium alloys, the cutting temperature plays a vital role that directly influences the performance and it is required to maintain as low as possible. In this study, a dual nozzle Vortex Tube Cooling System (VTCS) that supplies cool compressed CO2 gas is developed to reduce the cutting temperature in Ti-6Al-4V machining. The experiments were conducted at constant cutting and flow parameters during turning at different levels of …
Published in Journal of Polymer & Composites · Vol. 12, Issue 5, 2024 · pp. 284–291 Read article
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Modeling of Shell and Tube Heat Exchanger
Abstract: A heat exchanger is a equipment for transferring thermal energy between two fluids. Transfer of heat from one fluid to another is the most employed operations in chemical process industries. They are either used for heating or cooling. The most common application of heat transfer is to transfer heat from one fluid to another. The thermal design of shell and tube heat exchanger is discussed in detail in this paper. …
Published in Emerging Trends in Chemical Engineering · Vol. 3, Issue 1, 2016 · pp. 9–11 Read article
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Numerical Investigation of Louvered Fins for Efficient Cooling of Automotive Engines
Abstract: Air cooled fins are designed to cool motorcycle engines or similar class of small vehicles bytransferring the heat to the air as it passes in-between the fins at high speed. The air circulation andfin geometry are interdependent, and improved air circulation leads to more efficient cooling. So, inthis study a parametric numerical investigation is conducted on a new conceptual design of air-cooled fins. Design parameters are set as: fin pitch, …
Published in Journal of Automobile Engineering and Applications · Vol. 8, Issue 1, 2021 · pp. 6–16 Read article
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Heat Transfer Augmentation in Twisted Rectangular Channel
Abstract: Abstract The best way to profoundly and scientifically concentrate the heat exchange upgrade of nanofluids under turbulent course through twisted rectangular channels under consistent heat flux conditions on every one of the walls is to look at the marvel numerically. The nanofluids are fundamentally the strong nanoparticle of CuO suspended in water arranged chemically. CFD investigation is led utilizing FLUENT programming by the limited volume technique. The limit conditions connected …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 4, Issue 2, 2017 · pp. 47–55 Read article
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Heat Transfer Augmentation in Twisted Rectangular Channel
Abstract: The best way to profoundly and scientifically concentrate the heat exchange upgrade of nanofluids under turbulent course through Twisted Rectangular channels under consistent heat flux conditions on every one of the walls is to look at the marvel numerically. The nanofluids are fundamentally the strong nanoparticle of CuO suspended in water arranged chemically. CFD investigation is led utilizing FLUENT programming by the limited volume technique. The limit conditions connected are …
Published in Journal of Nanoscience, NanoEngineering & Applications · Vol. 10, Issue 2, 2020 · pp. 8–17 Read article
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Enhancement of Thermo-hydraulic Properties of a Novel Composite-Based Spiral Fin Tube Heat Exchanger: An Experimental Investigation
Abstract: It is now crucial for engineers to enhance procedures and boost heat exchanger efficiency. Heat exchanger performance can be significantly enhanced by a variety of methods. Composite-based fins or enlarged surfaces are frequently utilized to increase the air-side heat transfer rate in a variety of heat transfer applications. Because composite materials are lightweight, highly thermally conductive, and resistant to corrosion, they were used. A composite based fin's efficiency is influenced …
Published in Journal of Polymer & Composites · Vol. 13, Issue 5, 2025 · pp. 238–251 Read article
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Computational Heat Transfer Analysis of Corrugated Heat Sink Fins
Abstract: AbstractTo find the behavior of heat transfer and thermal management of novel type heat sink fins, a CFD analysis has been carried out. Available heat sink designs are studied for the thermal management of electronic devices, concentric solar devices, LED’s, etc. Electronic devices emerged in last decade and thus cooling of electronic devices with the efficient solution is still immature. In this study, corrugated type fins are introduced and analyzed …
Published in Journal of Thermal Engineering and Applications · Vol. 5, Issue 1, 2018 · pp. 17–27 Read article
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Performance Analysis of Double Coil Wire Inserts for Heat Transfer in a Circular Tube
Abstract: Abstract This work represents the experimental investigation results for turbulent flow heat transfer in a horizontal pipe by using double coil wire inserts and air as working fluid, experiments were carried out for a tube with and without double coil wire inserts at constant heat supply and different mass flow. The double coil wire insert are four different pitch of 12, 14, 16 and 18 mm and three different wire …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 2, Issue 3, 2015 · pp. 25–33 Read article