This document summarizes an analysis of heat transfer characteristics in a cross-flow plate fin heat exchanger using non-Newtonian fluids. The study used a cross-flow plate fin heat exchanger constructed of aluminum with corrugated fins to transfer heat between hot water and cold fluids of varying concentrations of carboxy methyl cellulose (CMC). Experiments were conducted at different flow rates and CMC concentrations to determine parameters such as heat transfer coefficients, effectiveness, and heat transfer performance. Results showed that increasing CMC concentration and flow rate affected these parameters.
Heat transfer and pressure drop characteristics of Air- liquid heat exchangerIRJET Journal
This document presents an experimental study on the heat transfer and pressure drop characteristics of an air-liquid heat exchanger using an ethylene glycol/water mixture as the coolant. The results showed that adding ethylene glycol to water increases the heat transfer coefficient and that the heat transfer coefficient further increases with higher coolant temperature and mass flow rate. Pressure drop also increases from adding ethylene glycol and with air velocity. The study aims to evaluate using ethylene glycol/water mixtures as enhanced heat transfer coolants in heat exchangers.
This document summarizes an experimental study on enhancing heat transfer in a corrugated plate heat exchanger by adding aluminum oxide (Al2O3) microparticles to water. The study used a 3-channel heat exchanger with sinusoidal corrugated plates at a 45 degree angle. Hot water was flowed through the central channel while water with varying concentrations of Al2O3 microparticles was flowed through the outer channels. Tested parameters included hot water inlet temperature from 40-70°C, Al2O3 volume concentration from 0-1.275%, and parallel vs counter flow configurations. Results showed adding Al2O3 microparticles increased heat exchanger effectiveness substantially, with counter flow seeing up to 0.96 effectiveness
IRJET- Comparsion of Heat Transfer Analysis of Double Pipe Heat Exchanger wit...IRJET Journal
This document describes an experimental study comparing heat transfer in a double pipe heat exchanger with and without a phase change material (PCM). Cynamide, which melts at 44°C, was used as the PCM. Hot water at 33°C and cold water at 20°C were circulated through the heat exchangers. Temperatures were recorded every 15 minutes. With the PCM, heat transfer increased when its melting temperature was reached, as the PCM absorbed heat during its phase change. The maximum heat transfer and effectiveness occurred in the setup with the PCM pipe, showing around a 20% increase in effectiveness compared to the setup without PCM. Equations for determining the heat transfer rate, maximum
Analysis The Performance of Parallel Flow and Heat Transfer in Concentric Tub...IRJET Journal
This document summarizes a research project analyzing heat transfer performance in concentric tube heat exchangers using computational fluid dynamics (CFD). The research models a double tube parallel flow heat exchanger in SolidWorks and runs CFD simulations to analyze fluid flow and heat transfer under varying parameters. The research aims to better understand heat transfer processes when fluids flow in a double concentric tube heat exchanger. Key findings of previous studies on heat transfer enhancement techniques for heat exchangers are also reviewed.
Design and Analysis of Heat Exchanger for Maximum Heat Transfer Rate (Multi M...IRJET Journal
This document summarizes a study on optimizing the design of a shell and tube heat exchanger to maximize heat transfer rate. The researchers designed a shell and tube heat exchanger using standard TEMA specifications. They then analyzed different tube designs, baffle inclinations, and coolant fluids using computational fluid dynamics simulations. The optimum design was found to be a tube with both angled and stepped sections, baffles inclined at 35 degrees, and a coolant of copper oxide nanoparticles in water. This design achieved a temperature drop of 48.6 degrees Celsius between the hot and cold fluids.
Analysis of Heat Transfer in Spiral Plate Heat Exchanger Using Experimental a...ijsrd.com
Heat transfer is the key to several processes in industrial application. In a present days maximum efficient heat transfer equipment are in demand due to increasing energy cost. For achieving maximum heat transfer, the engineers are continuously upgrading their knowledge and skills by their past experience. Present work is a skip in the direction of demonstrating the use of the computational technique as a tool to substitute experimental techniques. For this purpose an experimental set up has been designed and developed. Analysis of heat transfer in spiral plate heat exchanger is performed and same Analysis of heat transfer in spiral plate heat exchanger can be done by commercially procurable computational fluid dynamic (CFD) using ANSYS CFX and validated based on this forecasting. Analysis has been carried out in parallel and counter flow with inward and outward direction for achieving maximum possible heat transfer. In this problem of heat transfer involved the condition where Reynolds number again and again varies as the fluid traverses inside the section of flow from inlet to exit, mass flow rate of working fluid is been modified with time. By more and more analysis and experimentation and systematic data degradation leads to the conclusion that the maximum heat transfer rates is obtained in case of the inward parallel flow configuration compared to all other counterparts, which observed to vary with small difference in each section. Furthermore, for the increase heat transfer rate in spiral plate heat exchanger is obtain by cascading system.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
IRJET- Multi-Objective Optimization of Shell and Tube Heat Exchanger – A Case...IRJET Journal
This document presents a case study on the multi-objective optimization of a shell and tube heat exchanger at a factory in Ethiopia. The heat exchanger is currently not performing optimally, with water leaking from tubes into the shell. The study aims to modify the design through optimization of five decision variables - tube layout, tube diameter, fin height, fin space, and fin thickness. Both univariate and ant colony optimization techniques will be used to generate Pareto optimal solutions balancing heat transfer rate and cost. Thermal equations are provided to model heat transfer, pressure drop, effectiveness, and cost as objectives to be optimized. The best solution from both techniques will be selected based on requirements.
Experimental Investigation on Heat Transfer of Cylindrical Oblique Fin Micro-...IRJET Journal
This document describes an experimental investigation into the heat transfer performance of cylindrical oblique fin micro-channel heat exchangers for automotive engine cooling systems. The study compares a straight fin micro-channel heat exchanger to one with 12 degree oblique fins. Experiments were conducted on a test rig to determine the heat transfer coefficient, effectiveness, and pressure drop of the two designs under various air and water flow rates. The results showed that the oblique fin micro-channel heat exchanger achieved higher heat transfer efficiency and a smaller size than the straight fin design, demonstrating its potential to improve engine cooling system performance and reduce radiator size in automobiles.
IRJET- Numerical Investigation of Heat Transfer Enhancement in Circular Pipe ...IRJET Journal
1. The document numerically investigates heat transfer enhancement in a circular pipe with various rib geometries, including flat, conical, and right angle ribs.
2. It uses computational fluid dynamics to model water flow through the pipe with Reynolds numbers from 5000 to 60000 and a constant heat flux of 50 W/cm2 applied to the pipe surface.
3. The results show that ribs on the inside of the pipe enhance turbulence in the flow and produce recirculation, disturbing the thermal boundary layer and increasing the rate of heat transfer through the pipe.
Analysis of A Double Spiral Counter Flow Calorimeter in Impinging Flame Jet U...IJERA Editor
This document analyzes a double spiral counter flow calorimeter (DSCFC) using computational fluid dynamics (CFD). The DSCFC consists of two concentric spiral channels for fluid flow over a heated base plate, allowing for heat transfer between the solid and fluid. CFD simulations are performed using ANSYS-CFX to analyze heat transfer characteristics at varying Reynolds numbers and base temperatures. The results show heat transfer decreases with increasing Reynolds number but increases with higher base temperature. Pressure and temperature profiles within the DSCFC are also presented. In conclusion, the CFD analysis finds uniform pressure drop along the spiral channels except at the mid-length, with pressure and outlet temperature decreasing at higher Reynolds numbers.
A Review on Study of Heat Transfer Analysis of Helical Coil Heat Exchangersijtsrd
Now a day’s a geometrically modified Helical coil heat exchangers are widely using in industrial applications like cryogenic state processes, air conditioning, thermal nuclear reactors and waste heat recovery due to their compact size and high heat transfer coefficient. Advantage of using helical coils over straight tubes is that the residence time spread is reduced, allowing helical coils to be used to reduce axial dispersion in tubular reactors. In this study, numerical investigation of the influence of geometrical parameters such as tube diameter d , coil radius R , and coil pitch p on overall heat transfer coefficient in helical double tube heat exchangers are performed using a professional CFD software FLUENT. In recent years, numerous styles were introduced for heat exchangers that apply to completely different applications sadly, their heat transfer co efficient wasnt reliable at different operational conditions. the standard of the heat changed rate wasnt optimized and there have been many deficiencies and errors in styles. The heat transfer of the copper material is enhanced in comparison with other material unfortunately thermal resistance is reduced with an increase in pressure drop thus enhancing the heat transfer on the heat exchanger. Helical architecture is often designed with a clear motive of compact size and also address heat transfer co efficient and other ancillary attributes efficiently and effectively. So the better material is suggested for an industrial heat exchanger according to the applications is Copper with the basis of simulation results. The geometry and different dimension parameter of the helical coil show that the proposed study in different material properties and different mass flow rates to heat transfer are maximum in different parameter helical coil heat exchangers. Finally, the heat transfer increase for the copper material compared to another material but with the increase in pressure drop the corresponding thermal resistance decreases which allow the improved heat transfer rate and the rate increases from Aluminum to Bronze to Copper. With the drop in temperature, the thermal resistance is reduced which enhances the heat transfer rate. The simulation results show that the copper has a high heat transfer coefficient than Aluminum and Bronze while operating in identical conditions. Due to the extensive use of helical coils in various applications, knowledge about the flow patterns and heat transfer characteristics are important. Atul Vats | Sunil Kumar Chaturvedi | Abhishek Bhandari "A Review on Study of Heat Transfer Analysis of Helical Coil Heat Exchangers" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd43650.pdf Paper URL: https://www.ijtsrd.comengineering/mechanical-engineering/43650/a-review-on-study-of-heat-transfer-analysis-of-helical-coil-heat-exchangers/atul-vats
IRJET-Experimental Study on Helical Tube Heat Exchanger by Varying Cross Sect...IRJET Journal
This document presents an experimental study on a helical tube heat exchanger. The study varies the cross-section of the tubes by adding nano particles like TiO2 and SiO2 to the working fluid. The performance of a helical coil heat exchanger is analyzed and compared to a straight tube heat exchanger based on parameters like log mean temperature difference (LMTD), heat transfer coefficient, and Reynolds number. The results show that a helical coil heat exchanger with nano particles added to the working fluid is more efficient, with its overall heat transfer coefficient increasing with mass flow rate.
CONVECTIVE HEAT TRANSFER ANALYSIS IN A HELICAL COILIRJET Journal
This document describes an experimental study of convective heat transfer in a helical coil. The study involves fabricating a setup using a copper coil submerged in a water bath inside a cylindrical tank. Thermocouples are used to measure temperatures at different positions along the coil. Experiments are conducted for different heat input levels and fluid flow rates both with and without agitation. The results are used to calculate heat transfer coefficients, Nusselt number, Reynolds number, and overall heat transfer coefficient. The aim is to better understand the heat transfer process in helical coils and determine the fluid providing maximum heat transfer.
Esign and thermal evaluation of shell and helical coil heat exchangereSAT Journals
Abstract
Heat exchangers are the important engineering equipments used for transferring heat from one fluid to another. Heat exchangers are widely used in various kinds of application such as power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, petrochemical, mechanical, biomedical industries. Helical coil heat exchangers are gaining wide importance now-a-days because it can give high heat transfer coefficient in small footprint of surface area. This paper focuses on the designing of shell and helical coil heat exchanger and its thermal evaluation with counter flow configuration. The thermal analysis is carried out considering the various parameters such as flow rate of cold water, flow rate of hot water, temperature, effectiveness and overall heat transfer coefficient.
Keywords— Helical coil heat exchanger, Counter flow, Flow rate, effectiveness, heat transfer coefficient etc.
Experimental Study of Heat Transfer Enhancement in Triple Tube Heat Exchanger...IRJET Journal
The document describes an experimental study of heat transfer enhancement in a triple tube heat exchanger using CuO and Al2O3 nanofluids. A triple tube heat exchanger was tested with hot water flowing through the intermediate tube and cold water flowing through the inner and outer tubes. Nanofluids of CuO and Al2O3 with a 0.033% volumetric concentration were used. The heat transfer rate and effectiveness of the triple tube heat exchanger were evaluated experimentally for different flow rates of the hot fluid, with the cold fluid flow rate held constant. The results showed that use of nanofluids increased the heat transfer rate and effectiveness compared to using plain water as the working fluid.
Critical heat flux enhancement in pool boiling with al2 o3 water nanofluideSAT Journals
Abstract Boiling is an important phase change phenomena as it plays a crucial role in the design of high heat flux system like boilers, heat exchangers, microscopic heat transfer devices. However boiling phenomenon is limited by critical heat flux. At critical heat flux material of heated surface suffers physical damage due to lower heat transfer resulting from thin film formed over the surface. Now a days Nanofluid which is colloidal suspension of nanoparticle in base fluid is highlighted as innovative techniques to enhance critical heat flux. In the present study Al2O3 nanoparticles were characterized by using SEM and XRD analysis. From SEM images it was seen that nanoparticle has spherical morphology, and from XRD analysis average nanoparticle size determined was 29.48 nm. Five different nanofluids of concentration range from 3 gram/liter to 15 gram/liter were prepared. Critical heat flux (CHF) of each Al2O3-water nanofluid in pool boiling is determined on NiCr wire of SWG 28. The minimum critical heat flux enhancement is 30.53% at 3 gram/liter nanofluid compared to critical heat flux of distilled water. The highest critical heat flux enhancement is 72.70 % at 12 gram/liter nanofluid. Critical heat flux of nanofluid increases with increase in concentration of Al2O3 nanoparticle in distilled water up to 12 gram/liter nanofluid. Surface roughness of bare wire was 0.126 μm. Surface roughness of wire sample used in pool boiling of 3 gram/liter nanofluid is 0.299μm and highest surface roughness was 0.715 μm of heater used in pool boiling of 12 gram/liter nanofluid. The Surface roughness measurement results show the evidence of nanoparticle deposition on wire surface and its effect on Critical Heat Flux enhancement. Keywords: Critical heat flux, Nanoparticle, Nanofluid, Concentration, Surface roughness.
CFD Investigation of Compact Heat Exchanger Having Different Fins with Nanofl...IRJET Journal
This document summarizes research on using computational fluid dynamics (CFD) to investigate heat transfer in a compact heat exchanger with different fin types and titanium dioxide nanofluid. It discusses past research on various techniques for enhancing heat transfer and reducing pressure losses in heat exchangers. The document then outlines the objectives, methodology, and potential implications of research using CFD and limited experimental data to develop new heat transfer and pressure drop correlations for plain, offset strip, and wavy fins, which are common in applications like cryogenics and aerospace. These new correlations could provide more accurate and broadly applicable insights for heat exchanger design compared to existing correlations.
IRJET- Heat Exchanger Analysis and Method to Improve its EffectivenessIRJET Journal
This document discusses heat exchanger analysis and methods to improve heat exchanger effectiveness. It begins with an abstract that outlines analyzing heat exchangers using the log-mean temperature difference and number of transfer unit methods. It then discusses varying the mass flow rates of the hot and cold fluids in a counter flow heat exchanger and analyzing the effects on parameters like effectiveness, heat transfer coefficient, and capacity ratio. The key findings are that decreasing the mass flow rates of both the hot and cold fluids leads to increased heat exchanger effectiveness.
IRJET- Experimental Analysis on Performance of Closed Loop Pulsating Heat Pip...IRJET Journal
This document analyzes the performance of a closed loop pulsating heat pipe (CLPHP) using aluminum oxide nanofluid (Al2O3/water) as the working fluid. An experimental setup is described that includes a CLPHP with evaporator, adiabatic, and condenser sections. Nanofluids with 0.25%, 0.5%, 0.75%, and 1% Al2O3 nanoparticle concentrations by weight were tested, along with pure water. Testing was conducted by varying the heat input and measuring temperatures. Results showed that thermal resistance decreased with increasing heat load and nanofluid concentration, indicating nanofluids improved heat transfer performance over pure water. The 1% nanofluid provided the lowest thermal resistance
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