The Experts below are selected from a list of 76083 Experts worldwide ranked by ideXlab platform
Tan Jianyu - One of the best experts on this subject based on the ideXlab platform.
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heat transfer performance enhancement and Thermal Strain reStrain of tube receiver for parabolic trough solar collector by using asymmetric outward convex corrugated tube
Energy, 2016Co-Authors: Wang Fuqiang, Han Huaizhi, Tan Jianyu, Tang Zhexiang, Gong Xiangtao, Li BingxiAbstract:Abstract With the aim to increase the overall heat transfer performance and reliability of tube receiver for parabolic trough solar collector system, asymmetric outward convex corrugated tube is introduced as the metal tube of parabolic trough receiver. An optical-Thermal-structural sequential coupled method was developed to study the heat transfer performance and Thermal Strain of tube receiver for parabolic trough solar collector system. Heat transfer performance and Thermal Strain comparisons between conventional tube receiver and asymmetric outward convex corrugated tube receiver are conducted. The researches indicated that the usage of asymmetric outward convex corrugated tube as receiver can enhance the heat transfer performance and reduce the Thermal Strain effectively. By using asymmetric outward convex corrugated tube as receiver, the maximum enhancement of overall heat transfer performance factor is 148% and the maximum reStrain of von-Mises Thermal Strain is 26.8%.
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parabolic trough receiver with corrugated tube for improving heat transfer and Thermal deformation characteristics
Applied Energy, 2016Co-Authors: Wang Fuqiang, Lai Qingzhi, Han Huaizhi, Tan JianyuAbstract:A symmetric outward convex corrugated tube design is introduced for parabolic trough receivers with the aim of increasing their heat transfer performance and reliability. An optical–Thermal–structural sequential coupled method was developed to analyze the heat transfer performance and Thermal deformation of the glass cover and metal tube of the parabolic trough receiver. The developed coupled method has been validated with experimental results conducted in the DISS test facility in Spain. The numerical results indicated that the introduction of a symmetric outward convex corrugated tube design for the metal tube of the parabolic trough receiver can effectively enhance the heat transfer performance and decrease the Thermal Strain. The effective heat transfer coefficient can be increased up to 8.4% and the maximum Thermal Strain of metal tube can be decreased up to 13.1% when symmetric outward convex corrugated tube is used at Re=81728, p/D=4.3. In addition, regression correlations are put forward in order to find an effective heat transfer coefficient and effective Nusselt number for the fluid flow in the parabolic trough receiver.
Li Wang - One of the best experts on this subject based on the ideXlab platform.
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influence of longitudinal rise of coolant temperature on the Thermal Strain in a cylindrical laser rod
Optics Letters, 2009Co-Authors: Zhigang Li, Xiulan Huai, Li WangAbstract:The Thermal Strain in a laser rod with a longitudinal temperature increase is modeled and analytically derived through the method of thermoelastic displacement potential and the method of Love displacement function. The analytical results show that in the absence of external forces, the longitudinal rise of fluid temperature has an unnoticeable effect on the Thermal stress profile in the laser rod. However, the Thermal Strain field caused by the temperature distribution under the traction free boundary condition has an evident variation in the longitudinal direction, which will considerably affect the laser transmission characteristics and the beam quality.
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an analytical solution to the Thermal stress and Thermal Strain in a cylindrical laser rod with longitudinal temperature rise
Volume 10: Heat Transfer Fluid Flows and Thermal Systems Parts A B and C, 2008Co-Authors: Zhigang Li, Xiulan Huai, Li WangAbstract:In this paper, a mathematical model of the Thermal stress and Thermal Strain in the laser medium was presented. An analytical solution was further derived for the Thermal stress and Thermal Strain in the laser rod through the method of Thermoelastic Displacement Potential and the method of Love Displacement Function. The analytical solution results show that under the traction free boundary conditions, the longitudinal rise of fluid temperature has little effect on the Thermal stress profile in the laser rod. However, the Thermal Strain field caused by both the temperature and the Thermal stress fields has an evident variation in the longitudinal direction, which will affect the laser transmission characteristics and the beam quality.Copyright © 2008 by ASME
Amy M Peterson - One of the best experts on this subject based on the ideXlab platform.
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effect of layer thickness on irreversible Thermal expansion and interlayer strength in fused deposition modeling
Rapid Prototyping Journal, 2017Co-Authors: Anthony Damico, Analise Debaie, Amy M PetersonAbstract:Purpose The aim of this paper is to examine the impact of layer thickness on irreversible Thermal expansion, residual stress and mechanical properties of additively manufactured parts. Design/methodology/approach Samples were printed at several layer thicknesses, and their irreversible Thermal expansion, tensile strength and flexural strength were determined. Findings Irreversible Thermal Strain increases with decreasing layer thickness, up to 22 per cent Strain. Tensile and flexural strengths exhibited a peak at a layer thickness of 200 μm although the maximum was not statistically significant at a 95 per cent confidence interval. Tensile strength was 54 to 97 per cent of reported values for injection molded acrylonitrile butadiene styrene (ABS) and 29 to 73 per cent of those reported for bulk ABS. Flexural strength was 18 to 41 per cent of reported flexural strength for bulk ABS. Practical implications The large irreversible Thermal Strain exhibited that corresponding residual stresses could lead to failure of additively manufactured parts over time. Additionally, the observed irreversible Thermal Strains could enable Thermally responsive shape in additively manufactured parts. Variation in mechanical properties with layer thickness will also affect manufactured parts. Originality/value Tailorable irreversible Thermal Strain of this magnitude has not been previously reported for additively manufactured parts. This Strain occurs in parts made with both high-end and consumer grade fused deposition modeling machines. Additionally, the impact of layer thickness on tensile and flexural properties of additively manufactured parts has received limited attention in the literature.
Huanming Lu - One of the best experts on this subject based on the ideXlab platform.
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calculation of critical layer thickness considering Thermal Strain in si1 xgex si Strained layer heterostructures
Journal of Applied Physics, 1998Co-Authors: Jingyun Huang, Zhizhen Ye, Huanming LuAbstract:In this article, interactions of Thermal Strain in growth of Si1−xGex Strained-layers on Si are analyzed. A formula of critical layer thickness (hc) is obtained based on energy balance considering Thermal Strain under the assumption that the screw dislocation energy density equals to the sum of the areal Strain energy density and Thermal Strain energy density. The relationship between the Thermal expansion coefficient associated with Thermal Strain and Ge content x is linear. Our calculated values for hc of Si1−xGex Strained layers on Si substrates versus mismatch, considering Thermal Strain, are better agreement with measurements of hc by People and Bean.
Hector Fuentes - One of the best experts on this subject based on the ideXlab platform.
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Influence of Chronic Heat Acclimatization on Occupational Thermal Strain in Tropical Field Conditions.
Journal of occupational and environmental medicine, 2016Co-Authors: Matt B. Brearley, Ian Norton, Daryl Rush, Michael Hutton, Steve Smith, Linda Ward, Hector FuentesAbstract:OBJECTIVE To examine whether non-heat acclimatized (NHA) emergency responders endure greater physiological and perceptual Strain than heat acclimatized (HA) counterparts in tropical field settings. METHODS Eight HA and eight NHA men urban search and rescue personnel had physiological and perceptual responses compared during the initial 4 hours shift of a simulated disaster in tropical conditions (ambient temperature 34.0 °C, 48% relative humidity, wet bulb globe temperature [WBGT] 31.4 °C). RESULTS From the 90th minute through to end of shift, HA (38.5 °C) sustained a significantly higher gastrointestinal temperature than NHA (38.1 °C) (mean difference 0.4 ± 0.2 °C, 95% confidence interval [CI] 0.2 to 0.7 °C, P = 0.005) despite comparable heart rate (P = 0.30), respiratory rate (P = 0.88), and axilla skin temperature (P = 0.47). Overall, perception of body temperature was similar between cohorts (P = 0.87). CONCLUSIONS The apparent tolerance of greater physiological Strain by HA responders occurred in the absence of perceptual differences.
