List of Titles

Authors: Peng, Lan , Li, You-Rong , Liu, Ying-Jie , Imaishi, Nobuyuki , Jen, Tien-Chien , Chen, Qing-hua
Date: 2007
Subjects: Bifurcation , Hysteresis , Flow pattern transition
Type: Article
Identifier: uj:5272 , ISSN 1040-7782 , http://hdl.handle.net/10210/14941
Description: Please refer to full text to view abstract
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Authors: Liao, Quan , Zhou, Chao , Cui, Wenzhi , Jen, Tien-Chien
Date: 2012
Subjects: Ground-source heat pumps
Type: Article
Identifier: uj:5271 , ISSN 1040-7782 , http://hdl.handle.net/10210/14940
Description: A ground-source heat pump (GSHP) uses the earth as a heat source or heat sink to extract or reject the thermal energy. Since the annual temperature fluctuation of soil under the ground is relatively small, the GSHP system has been recognized as one of the most energy-efficient systems for space heating and cooling in residential and commercial buildings. In a GSHP system, one of the most important components is the ground-coupled heat exchanger, through which thermal energy is exchanged between heat carrier fluid (i.e., water or water-antifreeze fluid) and soil. Since the ground heat exchanger is responsible for a major portion of the initial cost of the GSHP system, and the efficiency of this system depends on the performance of a ground heat exchanger, careful design of the ground heat exchanger is crucial for successful application of the GSHP system [1].
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Authors: Jen, Tien-Chien , Gutierrez, Gustavo , Eapen, Sunil
Date: 2011
Subjects: Numerical analysis , Cutting tools , Cutting temperatures
Type: Article
Identifier: uj:5243 , ISSN 1040-7782 , http://hdl.handle.net/10210/14843
Description: In any cutting process, plastic deformation involved in chip formation and friction between the tool and the workpiece produces heat by the conversion of mechanical energy. A portion of this heat conducts into the tool and results in high temperatures near the cutting edge. As the temperature increases, the tool becomes softer and wears more rapidly, thus having a negative impact on tool life. In many cutting processes, tool life, or tool wear, is the major limitation to the process viability. Increased temperature also affects the dimensional accuracy of the products and machining efficiency. Because of these considerations, it is crucial to be able to predict accurately the tool temperature. Cutting temperatures have been studied widely for a number of years. Most research, however, has been restricted to steady state temperatures in relatively simple processes, such as orthogonal cutting or cylindrical turning, in which the cutting speed, feed rate, and the depth of cut are constant [1^3, 17, 21, 24]. In most industrial machining processes, however, these parameters vary with time so that a steady state temperature assumption may not be valid.
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Authors: Liao, Quan , Jen, T.-C.
Date: 2008
Subjects: Fluid flow , Heat transfer
Type: Article
Identifier: uj:5274 , ISSN 1040-7782 , http://hdl.handle.net/10210/14943
Description: The study of viscous flow in curved ducts is of fundamental interest in fluid mechanics due to the numerous applications such as flows through turbomachinery blade passages, aircraft intakes, diffusers, heat exchangers, and so on [1–6]. The major effect of curved ducts on the fluid flow involves the strong secondary flow due to the longitudinal curvature in the geometry [7–9]. The presence of longitudinal curvature generates centrifugal force (which is perpendicular to the main flow along the axis) and produces so-called secondary flow on the cross sections of ducts.
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Authors: Jiao, Y. , Jen, Tien-Chien , Jiao, Yuning
Date: 2011
Subjects: Numerical simulation , Solute redistribution , Transient liquid phase , Aluminum alloys , Copper alloys
Type: Article
Identifier: uj:5246 , ISSN 1040-7782 , http://hdl.handle.net/10210/14852
Description: A one-dimensional mathematical model is developed to predict the solute redistribution during the transient liquid phase (TLP) bonding process for Al-Cu alloy. The macroscopic solute diffusion in the liquid and the solid as well as for the solid transformation to the liquid because of the solute macrosegregation are considered in this study. The effects of holding temperatures and the interlayer thickness on the holding time, remelting layer thickness, and the mush zone thickness of the TLP bonding process are investigated. It is shown numerically that the holding time, the holding temperature, and the interlayer thickness influence the solute distribution strongly, which in turn influence the mush zone thickness significantly.
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Authors: Jen, T.C , Shaeri, Mohammad Reza , Jen, Tien-Chien
Date: 2012
Subjects: Heat transfer , Perforated fins
Type: Article
Identifier: uj:5261 , ISSN 1040-7782 , http://hdl.handle.net/10210/14930
Description: Turbulent heat transfer characteristics of three-dimensional and rectangular perforated ﬁns, including perforation like channels along the length of the ﬁns, are investigated. Both dimensions and numbers of perforations are changed at the highest porosity in the study of Shaeri and Yaghoubi [7] to determine the effects of perforation sizes on the heat transfer characteristics of the perforated ﬁns. Results show that at a speciﬁc porosity, a ﬁn with a higher number of perforations enhances the heat transfer rate more efﬁciently. Also, total drag is not only remarkably lower in perforated ﬁns compared with a solid ﬁn, but also becomes smaller by decreasing the number of perforations.
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