• Title/Summary/Keyword: Cooling analysis

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A Study on Warpage of Bobbin Molded by Injection Molding Process (Bobb in 성형품의 변형에 관한 연구)

  • 김병곤;민병현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.811-814
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    • 2001
  • Warpage analysis of bobbin, molded by injection molding process was performed. Concerned with a mold design, cooling system was designed based on Taguchi method, the distance between cavity wall and cooling channel was most influent factor amongst four design variables like an inlet temperature of coolant, a coolant flow rate, a diameter of cooling channel, and the distance between cavity wall and cooling channel. Optimal packing processes to reduce the warpage of molded part was analyzed based on the response surface method by considering holding pressure. Their optimal processing conditions were 9.4 seconds, 5.3 seconds, 15.2 seconds, and 85MPa, respectively.

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Study on Flow Resistance by the Design of Cooling Fan (냉각 팬의 설계에 의한 유동저항에 관한 연구)

  • Cho, Jae-Ung
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.1
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    • pp.41-47
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    • 2011
  • In this study, the structural analysis of cooling fan is combined with 3-D flow analysis by using CFD on fluid domain. The smoothly cooling flow with optimum design of cooling parts is essential at automotive combustion engine. The fan shape is modeled with three kinds of shape by varying the radius of the fan blade. By the results of analysis, the flow at Model I is more uniform than Model II or III. And the displacement at Model I is less than Model II or III. As the flow resistance of cooling fan at Model I decreases more than Model II or III, the efficiency becomes better.

Thermal analysis of Current lead for Liquid/Conduction cooling on Superconducting system (액체/전도냉각형 초전도 시스템에서 전류도입선의 열적 해석)

  • 권기범;김형진;정은수;장호명
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.02a
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    • pp.178-181
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    • 2003
  • Intermediate cooling for current lead is used of thermal link in conduction cooling and cooled of itself in liquid cooling because it is put in liquid. If a existing formula for cooling load and optimal diameter-length of current lead is applied, it generate some more cooling load. Therefore, variation of thermal link height and holding depth in liquid is considered. This result is used of reducing cooling load of current lead occupying most of superconducting system load and applying liquid/conduction cooling systems.

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A Numerical Study on Cooling Characteristics of a Rocket-engine-based Incinerator Devised for High Burning Rate of Solid Particles (고체입자의 높은 연소율을 갖기 위해 고안된 로켓 엔진 기반 소각로의 냉각 해석)

  • Son, Jinwoo;Sohn, Chae Hoon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.20 no.2
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    • pp.1-10
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    • 2016
  • Cooling characteristics are investigated numerically in the chamber for high-performance burnout of wastes with solid phase. Before the combustion chamber is manufactured, combustion analysis is performed for evaluation of burning rate and cooling performance. A water cooling method is applied and its feasibility for cooling is examined depending on coolant flow rate. Another method of complex cooling is adopted by combining air film cooling with water cooling, leading to improved cooling performance.

Development of Simulation Program of Automotive Engine Cooling System (자동차 엔진냉각계의 해석 프로그램의 개발)

  • 배석정;이정희;최영기
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.11
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    • pp.943-956
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    • 2003
  • A numerical program has been developed for the simulation of automotive engine cooling system. The program determines the mass flow rate of engine coolant circulating the engine cooling system and radiator cooling air when the engine speed is adopted by appropriate empirical correlation. The program used the method of thermal balance at individual element through the model for radiator component in radiator analysis. This study has developed the program that predicts the coolant mass flow rate, inlet and outlet temperatures of each component in the engine cooling system (engine, transmission, radiator and oil cooler) in its state of thermal equilibrium. This study also combined the individual programs and united into the total performance analysis program of the engine cooling system operating at a constant vehicle speed. An air conditioner system is also included in this engine cooling system so that the condenser of the air conditioner faces the radiator. The effect of air conditioner to the cooling performance, e.g., radiator inlet temperature, of the radiator and engine system was examined. This study could make standards of design of radiator capacity using heat rejection with respect to the mass flow rate of cooling air. This study is intended to predict the performance of each component at design step or to simulate the system when specification of the component is modified, and to analyze the performance of the total vehicle engine cooling system.

Thermal Flow Analysis of Vehicle Engine Cooling System

  • Park, Kyoung-Suk;Won, Jong-Phil;Heo, Hyung-Seok
    • Journal of Mechanical Science and Technology
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    • v.16 no.7
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    • pp.975-985
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    • 2002
  • This paper deals with theoretical model developed for analyzing the heat transfer of automotive cooling systems. The model has a modular structure which links various cooling system submodels. From the model, heat transfer rate of automotive cooling systems can be predicted, providing useful information at the early stages of the design and development. The aim of the study is to develop a simulation program for automotive cooling system analysis and a performance analysis program for analyzing heat exchanger. Heat release rate from combustion gas to coolant through the cylinder wall in engine cylinder was analysed by using an engine cycle simulation program. In this paper, details of each submodel are described together with the overall structure of the vehicle model.

A Study on Heat Transfer Characteristics of Automotive Engine Cooling Control System (자동차용 엔진 냉각시스템의 열전달 특성에 관한 연구)

  • Park, Kyoung-Suk;Won, Jong-Pil;Jung, Dong-Hwa
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.22 no.8
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    • pp.1183-1194
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    • 1998
  • This paper describes a theoretical model developed for analyzing the heat transfer of automotive cooling systems. From the model, heat transfer rate of automotive cooling systems can be predicted, providing useful information at the early stages of the design and development. The aim of the study is to develop a simulation program for automotive cooling system analysis and a performance analysis program for analyzing heat exchanger. Heat release rate from combustion gas to coolant through cylinder wall in engine cylinder was analyzed by using a two zone combustion model. This paper studied how cooling condition would affect engine heat release rate and measured temperature distribution of coolant in water jacket.

Structural Analysis of Liquid Rocket Thrust Chamber Regenerative Cooling Channel at Room Temperature (액체로켓 연소기 재생냉각 채널 상온 구조해석)

  • Ryu Chul-Sung;Chung Yong-Hyun;Choi Hwan-Seok;Lee Dong-Ju
    • Journal of the Korean Society of Propulsion Engineers
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    • v.9 no.4
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    • pp.39-47
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    • 2005
  • The structural analysis and water pressure tests are performed for liquid rocket thrust chamber regenerative cooling channel specimens at room temperature condition. Material properties of copper alloy to be used in the elastic-plastic structural analysis are obtained by uniaxial tension test at room temperature. The plate-type cooling channel specimens are manufactured and performed water pressure test to verify the analysis results. The results of elastic-plastic structural analysis and water pressure test show resonable agreements though with minor differences and it is revealed that structural stability of regenerative cooling channel is highly affected by the manufacturing tolerances due to very thin cross-sectional thickness of the cooling channel.

Numerical analysis of the cooling effects for the first wall of fusion reactor (핵 융합로 제1벽의 냉각성능에 관한 수치해석적 연구)

  • Jeong, I.S.;Hwang, Y.K.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.11 no.1
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    • pp.18-30
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    • 1999
  • A heat transfer analysis for the two-dimensional (2-D) steady state using finite difference method (FDM) is performed to predict the thermal behavior of the primary first-wall (FW) system of fusion reactor under various geometric and thermo-hydraulic conditions, such as the beryllium (Be) armor thickness, pitch of cooling tube, and coolant velocity. The FW consists of authentic steel (type 316 stainless steel solution annealed) for cooling tubes, Cu for cooling tubes embedding material, and Be for a protective armor, based on the International Thermonuclear Experiment Reactor (ITER) report. The present 2-D analysis, the control volume discretized with hybrid grid (rectangular grid and polar grid) and Gauss-Seidel iteration method are adapted to solve the governing equations. In the present study, geometric and thermo-hydraulic parameters are optimized with consideration of several limitations. Consequently, it is suggested that the adequate pitch of cooling tube is 22-32mm, the beryllium armor thickness is 10-12mm, and that the coolant velocity is 4.5m/s-6m/s for $100^{\circ}C$ of inlet coolant temperature. The cooling tube should locate near beryllium armor. But, it would be better for locating the center of Cu wall, considering problems of material and manufacturing. Also, 2-D analysis neglecting the axial temperature distribution of cooling tube is appropriate, regarding the discretization error in axial direction.

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