Applications of Different Numerical Methods in Heat Transfer - A Review (original) (raw)
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The heat exchanger (HE) is a device that is used to complete the process of heat transfer between different matters without direct mixing. Therefore, it is of great importance in the transfer of energy and the completion of various energy transition processes. In the processes of HE between different energy systems, many factors influence and play a major and important role in the efficiency of transformation and exchange in forms of energy, such as the length, the material type, the exchange fluid, the surrounding environment, and many other factors. In this work, the effect of the HE length of the parallel and counter flow HEs was investigated based on the use of computer simulation programs. There was a significant impact of the exchange factors, especially the length of the HEs in both the parallel and counter-flow HEs, on the quality and efficiency of the HE and the temperature distribution. The overall evaluation shows that by increasing the length of the HE for both parallel ...
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Heat exchangers are an important component in many industrial systems especially in process industries. So many commercial types of heat exchangers are available in market for exchange of heat as well as for recovery of waste heat. Improved heat transfer efficiency leads to decrease in energy consumption which then results in lower equipment operational and maintenance cost, lower emissions, and consequently also lower environmental impact. However, common enhancement approaches such as adding fins or tube inserts may not always be suitable or feasible – especially in case of heat recovery from streams having a high fouling propensity. Since heat transfer rate depends also on flow field characteristics, fluid distribution, and fouling which can all be greatly influenced by the actual shapes of flow system components, several simplified models for fast and accurate enough prediction of fluid distribution as well as applications for shape optimization based on these models were developed. The created applications can then be employed during the design of heat exchange units to improve their performance and reliability.
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IOP Conference Series: Materials Science and Engineering, 2019
Thermal stresses, thermal fatigue, materials’ constants variation with the temperature, residual stresses and micro-structure of the parts after the solidification process are heat transfer phenomenon related problems. The calculation instrument of a given age of science and technology has a great influence on the mathematical solutions and the according applications in engineering. The paper presents a synthesis, including the authors’ contributions in the heat transfer problems, which may be regarded in a broader context of the distinct branches of engineering that are the fields of expertise of the authors. The first step is to analyse the theoretical aspects to be mastered in order to wisely apply them in concrete engineering problems. In this way, there are presented the basic equations used by the authors in their analytical studies and the background of the numerical methods used in engineering, i.e. the finite difference method and the finite element method. In the following...
2012
Optimization of the Thermal Efficiency of a Two-Phase Closed Thermosyphon using Active Learning on the Human Algorithm Interaction Mehdi Shanbedi a , Saeed Zeinali Heris a , Ahmad Amiri b , Sadegh Adyani a , Mohsen Alizadeh a & Majid Baniadam a a Department of Chemical Engineering, Faculty of Engineering , Ferdowsi University of Mashhad , Mashhad , Iran b Department of Engineering, Marvdasht Branch , Islamic Azad University , Marvdasht , Iran Published online: 25 Jun 2014.
International Journal of Engineering Research and Technology (IJERT), 2020
https://www.ijert.org/design-and-analysis-of-heat-exchanger-for-determined-heat-transfer-rate-multi-model-optimization-procedure https://www.ijert.org/research/design-and-analysis-of-heat-exchanger-for-determined-heat-transfer-rate-multi-model-optimization-procedure-IJERTV9IS090256.pdf Heat exchanger as the name indicates it transfers heat from one fluid to another which are at changed temperatures. Heat exchangers are devices built for efficient heat transfer from one fluid to another and are widely used in engineering processes. Some examples are intercoolers, pre-heaters, boilers and condensers in power plants. The heat transfer efficiency depends on both design of heat exchanger and property of working fluid. Some important design parameters such as the pitch ratio, tube length, and tube layer as well as baffle spacing. In this project, the heat transfer efficiency is improved by implementing the full baffle design and travel tube design and analyzing it through CFD flow simulation to find the approximate heat transfer rates. From the simulation results the optimum baffle design and travel tube design for maximum heat transfer rate is identified. Also this project deals with find the suitable fluid for maximum heat transfer rate.
REVIEW ON PERFORMANCE ANALYSIS OF HEAT EXCHANGER.
Heat Exchanger is the key part in a thermal industry .Hence performance of heat exchanger affects the quality and productivity of thermal plant .Industrial management focusing on the development of mechanism of plant up to the optimum level to achieve lean and agile manufacturing of product. With the same view we need to optimize the performance of each machine of plant. To optimize the function of heat exchanger. This review it is an act to find the no of parameters and mode of heat exchanging which affects the performance of heat exchanger.
To investigate the effect of insert on heat transfer in heat exchanger
2017
Heat transfer enhancement has been always a significantly interesting topic in order to develop high efficient, low cost, light weight, and small heat exchangers. The energy cost and environmental issue are also encouraging researchers to achieve better performance than the existing designs. The various effective ways to achieve higher heat transfer rate in heat exchangers are using different kinds of inserts and modifying the heat exchanger tubes. The present work is on the heat transfer enhancement in a circular tube. In the present work emphasis is given to works dealing with analysis of different inserts and their effects on heat transfer rate because according to the recent studies, these are known to be economic in the field of heat transfer enhancement. The inner and outer diameters of the copper tube are 25 mm and 26.5 mm respectively. The twisted tapes were made of the copper and aluminium strip with thickness of 2mm and the length of 1220 mm. The effects of other three types of tapes including, The copper twisted tape with twist ratio (y) of 6.6 and 8.26 , (2) The aluminium twisted tape with twist ratio (y) of 6.0, are also studied for comparison. All twisted tapes used are twisted at constant twist length(y). Heat Transfer enhancement techniques are used to increase rate of Heat transfer. The heat transfer coefficient increases with Reynolds number. The experimental data obtained are compared with those obtained from plain tube. The heat transfer coefficient increases with twist ratio. The empirical correlations developed in terms of twist ratio, Reynolds number, Nusselt number and friction factor. Heat transfer techniques are mostly used in areas such as thermal power plants, airconditioning equipment, radiators for space vehicles, automobiles, power sector, process industries, Industrial heat recovery, Electronics cooling, Aerospace.