scholarly journals Numerical Analysis on Temperature Field of Grinding Ti-6Al-4V Titanium Alloy by Oscillating Heat Pipe Grinding Wheel

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 670 ◽  
Author(s):  
Ning Qian ◽  
Zhengcai Zhao ◽  
Yucan Fu ◽  
Jiuhua Xu ◽  
Jiajia Chen
Keyword(s):  
Temperature Field ◽  
Numerical Analysis ◽  
Heat Pipe ◽  
Thermal Conduction ◽  
Three Dimensional ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Heat Accumulation ◽  
Conduction Model ◽  
Oscillating Heat Pipe

When grinding hard-to-machining materials such as titanium alloys, a massive grinding heat is generated and gathers in the grinding zone due to the low thermal conduction of the materials. The accumulated grinding heat easily leads to severe thermal damages to both the workpiece and the grinding wheel. A novel oscillating heat pipe (OHP) grinding wheel is one of the solutions to this phenomenon. The oscillating heat pipe grinding wheel can transfer the grinding heat directly from the grinding zone to avoid heat accumulation and a high temperature rise. In this paper, the temperature field of the grinding Ti-6Al-4V alloy is investigated, via the oscillating heat pipe grinding wheel, by numerical analysis. The three-dimensional thermal conduction model is built accordingly, containing the grinding wheel, grinding zone and Ti-6Al-4V workpiece. Due to the enhanced heat transport capacity of the oscillating heat pipe grinding wheel, the highest temperature in the grinding zone and the temperature on the ground surface of the workpiece decrease dramatically. For example, under a grinding heat flux of 1 × 107 W/m2, when using the grinding wheel without OHP and with OHPs, the highest temperature in the grinding zone drops from 917 °C to 285 °C by 68.7%, and the ground surface temperature decreases from 823 °C to 244 °C by 71.2%. Moreover, the temperature distribution on the grinding wheel is more uniform with an increase of the number of oscillating heat pipes.

Structure optimization of a three-dimensional coil oscillating heat pipe

2021 ◽  
pp. 122229
Author(s):  
Lilin Chu ◽  
Yulong Ji ◽  
Zhang Liu ◽  
Chunrong Yu ◽  
Zhenting Wu ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Three Dimensional ◽  
Structure Optimization ◽  
Oscillating Heat Pipe

2D numerical analysis of energy harvesting in oscillating heat pipe using piezoelectric transducers

2017 ◽  
Author(s):  
Sajiree Vaidya ◽  
Oliver Myers ◽  
Scott Thompson ◽  
Nima Shamsaei ◽  
John G. Monroe
Keyword(s):  
Numerical Analysis ◽  
Energy Harvesting ◽  
Heat Pipe ◽  
Piezoelectric Transducers ◽  
Oscillating Heat Pipe

An Experimental Investigation of Three-Dimensional Flat-Plate Oscillating Heat Pipe

2009 ◽  
Author(s):  
Scott M. Thompson ◽  
Hongbin Ma ◽  
Robert A. Winholtz ◽  
Corey Wilson
Keyword(s):  
Experimental Investigation ◽  
Flat Plate ◽  
Heat Pipe ◽  
Three Dimensional ◽  
Neutron Imaging ◽  
Heat Fluxes ◽  
Working Fluid ◽  
Oscillating Heat Pipe ◽  
Oscillatory Pattern ◽  
Thermal Oscillations

An experimental investigation on the effects of condenser temperatures, heating modes and heat inputs on a miniature, three dimensional flat-plate oscillating heat pipe (3D FP-OHP) was conducted visually and thermally. The 3D FP-OHP was charged with acetone at a filling ratio of 0.80, had dimensions of 101.60 × 63.50 × 2.54 mm3, possessed 30 total turns, and had square channels on both sides of the device with a hydraulic diameter of 0.762 mm. Unlike traditional flat-plate designs, this new three-dimensional, compact design allows for multiple heating arrangements and higher heat fluxes. Transient and steady-state temperature measurements were collected at various heat inputs and the activation/start-up was clearly observed for both bottom and side heating modes during reception of its excitation power for this miniature 3D FP-OHP. The neutron imaging technology was simultaneously employed to observe the internal working fluid flow for all tests directly through the heat pipe’s copper wall. The activation was accompanied with a pronounced temperature field relaxation and the onset of chaotic thermal oscillations — all occurring with the same general oscillatory pattern at locations all around the 3D FP-OHP. Qualitative and quantitative analysis of these thermal oscillations, along with the presentation of the average temperature difference and thermal resistance, for all experimental conditions are provided. The novelty of the three-dimensional OHP design is its ability to still produce the oscillating motions of liquid plugs and vapor bubbles and, more importantly, its ability to remove higher heat fluxes.

Numerical Analysis of a Metal Hydride Reactor With Embedded Heat Pipes to Enhance Heat Transfer Characteristics

2009 ◽  
Author(s):  
Joon Hong Boo ◽  
Young Hark Park ◽  
Masafumi Katsuta ◽  
Sang Chul Bae
Keyword(s):  
Thermal Conductivity ◽  
Numerical Analysis ◽  
Heat Pipe ◽  
Metal Hydride ◽  
Three Dimensional ◽  
Heat Pipes ◽  
Thermal Control ◽  
Hydrogen Gas ◽  
Outer Diameter ◽  
Reactor Model

Numerical analysis was conducted for a heat pipe application in a metal hydride (MH) reactor for hydrogen gas storage. The hydriding and dehydriding characteristics of MH strongly depend on temperature and pressure. Due to its extremely low thermal conductivity however, it is very difficult to control the temperature of MH, especially when it is of vast bulk as in an MH reactor. This study deals with heat pipes embedded into the MH to increase the effective thermal conductivity of the system and thus to enhance the thermal control characteristics. The existing model was a brine-tube type MH reactor having cylindrical container with outer diameter of 76 mm and length of 1 m, which was partially filled with 8 to 10 kg of MH material. The hydriding and dehydriding processes occur at 10°C and 80°C, respectively. The heat-pipe type reactor model replaced the brine tubes and channels with copper-water heat pipes of the same dimensions. Three-dimensional numerical analysis predicted that the heat-pipe type MH reactor model enhanced thermal performance with faster response to the change of boundary conditions and higher degree of isothermal characteristics. Discussion is presented based on the numerical results of the two models compared with experimental results.

Numerical Analysis on Temperature Field of Electric Connectors

2014 ◽  
Vol 852 ◽  
pp. 602-607
Author(s):  
Yan Yan Luo ◽  
Yi Wen ◽  
Liang Hao ◽  
Xin Wei Liu ◽  
Yi Jun Wang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Temperature Field ◽  
Numerical Analysis ◽  
Environmental Temperature ◽  
Three Dimensional ◽  
Internal Heat ◽  
Solid Model ◽  
Monitoring Test ◽  
Convection Cooling ◽  
Analysis Models

The steady-state thermal analysis models are established based on the thermal analysis of the Electric connectors. With the consideration to the internal heat conduction and the convection cooling, the three-dimensional solid model is imposed by the reasonable loads and boundary conditions and analyzed by ANSYS thermal analysis module. The numerical analysis is made on the temperature field of a certain type of Electric connectors at different environmental temperature and different working current. The simulation results are compared with the monitoring test data.

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