Experimental investigation of the temperature variation in the vacuum chamber during vacuum cooling

2007 ◽  
Vol 78 (1) ◽  
pp. 333-339 ◽  
Author(s):  
T.X. Jin
Keyword(s):  
Experimental Investigation ◽  
Temperature Variation ◽  
Vacuum Chamber ◽  
Vacuum Cooling

Analysis of the Thermal Behavior of a Ball Screw Based on Simulation and Experimental Investigation

2014 ◽  
Vol 577 ◽  
pp. 140-144
Author(s):  
Zi Han Li ◽  
Kai Guo Fan ◽  
Jian Guo Yang
Keyword(s):  
Finite Element Analysis ◽  
Experimental Investigation ◽  
Finite Element ◽  
Boundary Conditions ◽  
Thermal Behavior ◽  
Temperature Variation ◽  
Ball Screw ◽  
Variation Pattern ◽  
Element Analysis ◽  
Thermal Boundary Conditions

Thermal expansion of ball screw system affects the machining accuracy of machine tools significantly. The objective of this paper is to analyze the thermal behavior and predict the temperature variation pattern of a ball screw based on finite element analysis and experimental investigation. Wireless temperature sensors are used to monitor the temperature variation of the ball screw system under different thermal conditions during both the warm-up and cooldown phases, so as to investigate its temperature variation pattern. Then an exponential algorithm is proposed to analyze and predict the temperature variation of the ball screw based on finite element analysis, and the actual thermal boundary conditions of the ball screw system are exactly defined according to the proposed algorithm and the experimental results. Finally, it was found that the simulation based on the thermal boundary conditions identified herein could match quite well with the experimental results.

Heat and Mass Transfer of Cabbage in Vacuum Cooling and Experimental Research

2011 ◽  
Vol 467-469 ◽  
pp. 680-685
Author(s):  
An Kang Kan ◽  
Hou De Han ◽  
Quan Ping Duan
Keyword(s):  
Mass Transfer ◽  
Mathematical Models ◽  
Heat And Mass Transfer ◽  
Vacuum Chamber ◽  
Cylindrical Shape ◽  
Cooling Device ◽  
Vacuum Degree ◽  
Vacuum Cooling ◽  
Cooling Technology ◽  
Comparison And Analysis

The pre-cooling device was built and the columnar cabbage was taken as the study object in this paper. The heat and mass transfer mathematical models for the cylindrical shape vegetable were built and the experimental method was introduced to prove them. The comparison and analysis, under the certain vacuum degree of the vacuum chamber, was done between the simulation and the experiment. And the differences of the vacuum degree in the chamber, the temperature change of the cabbage, the relative humidity in the chamber and the cabbage mass loss, in the experiment and the simulation, were all recorded. The reason of the parameters variance and existent deference was also analyzed in this paper. The mathematical models and the result were useful for the study on the cylindrical vegetable vacuum pre-cooling technology.

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