Heat Transfer: Volume 4最新文献_第7页

Thermal Analysis of an Absolute Radiometer Designed for the Future Satellite Mission of Total Solar Irradiance Measurement 为未来太阳总辐照度测量卫星任务设计的绝对辐射计的热分析

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1119

Y. J. Shen, D. Chen, Z. M. Zhang

{"title":"Thermal Analysis of an Absolute Radiometer Designed for the Future Satellite Mission of Total Solar Irradiance Measurement","authors":"Y. J. Shen, D. Chen, Z. M. Zhang","doi":"10.1115/imece1999-1119","DOIUrl":"https://doi.org/10.1115/imece1999-1119","url":null,"abstract":"\u0000 This work employs finite element (FE) software to perform a thermal modeling of a proposed absolute radiometer designed for the future satellite mission of total solar irradiance measurement. Both steady-state and transient analyses have been performed to obtain the temperature distribution and history. The cavity-type absolute radiometer employs the electrical-substitution technique and active temperature control to determine the radiant power entering the receiving cavity. The nonequivalence between the shutter-open mode and shutter-closed mode due to different temperature distributions is a major factor that affects the radiometric accuracy. The steady-state analysis shows that the nonequivalence is a function of sensor positions and can be minimized by properly choosing the electrical heating method and the temperature sensor location. The transient analysis provides the temperature response for a step power input. In order to reduce the computational time, simplified lumped-heat-capacity models have been developed by applying the least-squares fitting technique to the transient result of the FE model. The two-lumped-heat-capacity model demonstrates a better accuracy than the single-lumped-heat-capacity model and will facilitate the controller design.","PeriodicalId":120929,"journal":{"name":"Heat Transfer: Volume 4","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124405220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Performance and Modeling of Heat Flux Sensors in Different Environments 热通量传感器在不同环境下的性能与建模

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1105

D. Holmberg, C. Womeldorf

引用次数: 12

Three Dimensional Reconstruction From Limited Projection Data Using a Novel MART Algorithm 基于MART算法的有限投影数据三维重建

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1101

D. Mishra, K. Muralidhar, P. Munshi

引用次数: 0

Data Reduction Methodology for Fast-Response Schmidt-Boelter Heat-Transfer Gages 快速响应Schmidt-Boelter传热计的数据缩减方法

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1103

John C. Adams, C. Kidd

引用次数: 0

Response of Loop Heat Pipes to Transient Heat Loads 循环热管对瞬态热负荷的响应

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1139

J. Long, J. Ochterbeck

引用次数: 0

Results of Implementing an Introductory Course: Foundations of Thermal-Fluid Sciences 热流体科学基础导论课程的实施结果

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1137

J. Ochterbeck, J. Gaddis

引用次数: 1

Survey of Research Activities for Passive Safety System of AC600 AC600被动安全系统研究活动综述

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1127

Bingde Chen, Zhumao Yang, Fuyun Ji

{"title":"Survey of Research Activities for Passive Safety System of AC600","authors":"Bingde Chen, Zhumao Yang, Fuyun Ji","doi":"10.1115/imece1999-1127","DOIUrl":"https://doi.org/10.1115/imece1999-1127","url":null,"abstract":"\u0000 The use of passive safety system in AC600, the Chinese advanced 600 MWe PWR proposed by NPIC, together with other improvements, such as simplification and advanced I&C etc., makes the plant more safe, economic and reliable. The core damage frequency (CDF) decreases from less than 10−4 of conventional PWR to less than 10−5 to 10−6 and the plant available factor increases to ∼90%.\u0000 The passive safety system of AC600 consists of three complete independent systems. They are passive containment cooling system (passive CC system), passive core residual heat removal system (passive CRHR system) and passive safety injection system (CMT). To verify and demonstrate the AC600’s innovative passive safety features and to obtain an experimental database for system design modification and optimizing, and for computer code development and assessment, the experimental studies on these systems were finished in NPIC during the eighth national Five Year period under the national support.\u0000 In this paper, the experimental research activities on passive containment cooling system, passive CRHR system and CMT injection system, including test rigs and main results are summarized. These experiments proved the design of all these passive systems are feasible and reliable and can meet basically the required safety functions. Some undesired thermal hydraulic phenomena, for example, “water hammer”, which may have bad impacts on its safety functions and to which high attention should be given, was found and identified in these studies. All data obtained have already been used in the design improvement and next R&D program planning.","PeriodicalId":120929,"journal":{"name":"Heat Transfer: Volume 4","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133498005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of the Thermal and Velocity Fields in the Liquid Phase of Turbulent Subcooled Bubbly Boiling Flow 湍流过冷泡沸腾流液相热场和速度场的测量

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1133

R. Roy, S. Kang, J. A. Zarate

{"title":"Measurement of the Thermal and Velocity Fields in the Liquid Phase of Turbulent Subcooled Bubbly Boiling Flow","authors":"R. Roy, S. Kang, J. A. Zarate","doi":"10.1115/imece1999-1133","DOIUrl":"https://doi.org/10.1115/imece1999-1133","url":null,"abstract":"\u0000 To investigate the thermal and velocity fields in the liquid phase of turbulent subcooled boiling flow, local measurements were made in the bubbly regime. The boiling flow, of Refrigerant-113, was created in a vertical annular channel whose inner wall was heated. The technique involves the simultaneous use of a two-component laser Doppler Velocimeter (LDV) for measuring the velocity field, and a fast-response cold-wire for measuring the temperature field. The LDV measuring volume (m.v.) dimensions in the liquid were: 290 microns spanwise length × 55 microns diameter. The 3.8 micron diameter tungsten cold-wire had an active length of 300 microns and was placed 250 microns downstream of the center of the LDV m.v. The cold-wire in conjunction with an active phase-lead compensation circuit had a temperature response time constant of 0.3±0.02 ms in the liquid flow.\u0000 To validate the measurement technique, the velocity and thermal fields were first measured in heated single-phase liquid flow in the same channel and compared with the corresponding computed fields. Selected results are presented. Next, measurements in boiling flow at one experimental condition are presented and their intended use in multidimensional two-fluid modeling of the flow is briefly discussed.","PeriodicalId":120929,"journal":{"name":"Heat Transfer: Volume 4","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124249570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Proposed Experimental Technique for Measuring Heat Transfer Coefficients Using a Pulsed Periodic Surface Heat Flux 利用脉冲周期性表面热通量测量传热系数的实验技术

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1108

W. Turnbull, W. Carscallen

引用次数: 0

Resonance Based Force Measurement: Prelude to High-Resolution Anemometry for Liquid Metal Flows 基于共振的力测量:液态金属流动的高分辨率风速测量的前奏

Heat Transfer: Volume 4 Pub Date : 1999-11-14 DOI: 10.1115/imece1999-1098

S. Phan, R. Keanini, S. Smith, R. Hocken

{"title":"Resonance Based Force Measurement: Prelude to High-Resolution Anemometry for Liquid Metal Flows","authors":"S. Phan, R. Keanini, S. Smith, R. Hocken","doi":"10.1115/imece1999-1098","DOIUrl":"https://doi.org/10.1115/imece1999-1098","url":null,"abstract":"\u0000 This paper describes the first phase of a two-part project designed to develop a new anemometry method for use in high temperature liquid metal flows. The device will incorporate a dual-cantilever, PZT-driven touch sensor housed within a sealed, temperature resistant ceramic Pitot tube. Due to differing cantilever lengths, the device’s unloaded spectral response exhibits two distinct peaks, each corresponding to the cantilevers’ resonant frequencies. The principal of operation is based on the fact that pressure-induced forces on each cantilever produce resonant frequency shifts which can then be correlated with applied pressures. The first project phase has focused on development and testing of the dual cantilever touch-sensor and its supporting electronics. Two new concepts have been introduced in designing the touch sensor — use of a dual cantilever for simultaneous force measurement, and simultaneous detection of associated pressure-induced resonant frequency shifts. Here, we describe design of the Pitot tube, design and fabrication of the dual-cantilever sensor and electronics, and system modeling of the sensor. We also outline two pressure measurement schemes; in the first, pressure is correlated with resonant frequency shifts at constant phase while in the second, pressure is related to phase shifts (between forcing and response signals) at constant frequency. Device driving and sensing electronics have been fabricated as has the dual-cantilever touch sensor; preliminary experimental measurements of single and dual forces are presented.","PeriodicalId":120929,"journal":{"name":"Heat Transfer: Volume 4","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124371370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0