scholarly journals Simulation of a two-phase composite material with a system of fibers disoriented in space

2020 ◽  
Author(s):  
E. M. Romanovskaia ◽  
E. A. Mityushov ◽  
S. A. Berestova ◽  
N. D. Romanovskaia
Keyword(s):  
Composite Material ◽  
Two Phase

Experimental Characterization of a Carbon Fiber Composite Material Heat Sink in Boiling Heat Transfer Using FC-72

2006 ◽  
Author(s):  
Venugopal Gandikota ◽  
Harish Chengalvala ◽  
Amy S. Fleischer ◽  
G. F. Jones
Keyword(s):  
Heat Transfer ◽  
Composite Material ◽  
Carbon Fiber ◽  
Thermal Management ◽  
Thermal Performance ◽  
Heat Sink ◽  
Heat Fluxes ◽  
Two Phase ◽  
Operating Temperatures ◽  
Power Densities

The on-going trend towards increasing device performance while shrinking device size often results in escalating power densities and high operating temperatures. High operating temperatures may lead to reduced reliability and induced thermal stresses. Therefore, it is necessary to employ new and innovative thermal management techniques to maintain a suitable junction temperature at high power densities. For this reason, there is interest in a variety of liquid cooling techniques. This study analyzes a composite material heat sink. The heat sink consists of a very large number of small cross-section fins fabricated from carbon pitch fibers and epoxy. These carbon pitch fibers have a high thermal conductivity along the length of the fin. It is expected that the longer length will result in more heat transfer surface area and a more effective heat sink. This experimental study characterizes the thermal performance of the carbon-fiber heat sink in a two-phase closed loop thermosyphon using FC-72 as the operating fluid. The influence of heat load, thermosyphon fill volume, and condenser operating temperature on the overall thermal performance is examined. The results of this experiment provide significant insight into the possible implementation and benefits of carbon fiber heat sink technology in two-phase flow leading to significant improvements in thermal management strategies for advanced electronics. The carbon fiber heat sink yielded heat transfer coefficients in the range of 1300-1500 W/m2 K for heat fluxes in the range up to 3.2 W/cm2. Resistances in the range of 0.20 K/W – 0.23 K/W were achieved for the same heat fluxes. Condenser temperature and fill ratio did not show a significant effect on any of the results.

A Concept for a Material That Softens With Frequency

2008 ◽  
Vol 130 (9) ◽  
Author(s):  
J. Prasad ◽  
A. R. Diaz
Keyword(s):  
Composite Material ◽  
Elastic Modulus ◽  
Viscoelastic Properties ◽  
Dynamic Properties ◽  
Negative Stiffness ◽  
Numerical Homogenization ◽  
Two Phase ◽  
High Frequencies ◽  
Design Concepts ◽  
Inclusion Phase

This work presents design concepts to synthesize composite materials with special dynamic properties, namely, materials that soften at high frequencies. Such dynamic properties are achieved through the use of a two-phase material that has inclusions of a viscoelastic material of negative elastic modulus in a typical matrix phase that has a positive elastic modulus. A possible realization of the negative-stiffness inclusion phase is presented. A numerical homogenization technique is used to compute the average viscoelastic properties of the composite. The method and the properties of a composite material designed with it are demonstrated through an example.

Repair of Osteochondral Defect with Tissue-Engineered Two-Phase Composite Material of Injectable Calcium Phosphate and Hyaluronan Sponge

2002 ◽  
Vol 8 (5) ◽  
pp. 827-837 ◽  
Author(s):  
Jizong Gao ◽  
James E. Dennis ◽  
Luis A. Solchaga ◽  
Victor M. Goldberg ◽  
Arnold I. Caplan
Keyword(s):  
Composite Material ◽  
Calcium Phosphate ◽  
Osteochondral Defect ◽  
Two Phase
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