Thermal Analysis of the Battery Box in Electric Vehicles

Based on the analysis of heat mechanism of the lithium-ion battery, the thermal properties on specific heat capacity and thermal conductivity were obtained by experiment , and then established thermal model of the monomer battery. Moreover, to verify the correctness of the model and get temperature field distribution, the heat simulation of it by using ANSYS Fluent software was conducted, After that, the monomer battery was grouped into five, then the simulation analysis of the grouped battery was done on the case of natural convection and forced convection. Finally, we verified the validity of the simulation by experiment.

Studies on Properties of EKS Heat-Generating Fiber and Yarn

This article introduces the EKS heat-generating fiber and its heat mechanism. Studies on properties of EKS heat-generating fiber include the morphological structure, infrared spectrogram and single fiber strength. Studies on properties of EKS heat-generating fiber yarn include yarn strength, fineness uniformity, twist, moisture content, yarn hairiness, and acid and alkali resistance.

Transfer Heat Mechanism of Oil-Gas-Water Three-Phase Flow in Pipeline

It is well known that the oil-gas-water three-phase flow belongs to the field of multiphase flow,transfer heat mechanism of which is very complicated.Transfer heat mechanism is affected not only by different buries in oil gathering pipeline, but also by soil temperature periodicity change. Both domestic and oversea scholars have already studied on the transfer heat mechanisms of oil-gas-water three phase,but they are still in the level of fundamental theory and laboratory.This paper establishes transfer heat models of the oil-gas-water three-phase flow in buried oil gathering pipeline, including the physical model and the mathematical model,and testing in experiment .The purpose of this paper is to analyze value between the calculation and the testing . The results show that the mathematical model of this paper is accurate , and the relative error is ≤ 10%.

Study on Thermal Properties of Hybrid Journal Bearing for Super High Speed Grinding Machine

As the high speed bearings, hybrid journal bearings are usually used in high and super high speed grinding machine spindle system. Since the bearing operates under high speed conditions, the excessive temperature rise of bearing is a key factor to lower the accuracy of the spindle system and limit the bearings working speed, so restrict the bearing applications. In this paper, the model of hybrid journal bearing is established to analyze the heat mechanism. In addition, the temperature field distribution for the certain hybrid journal bearing at high speed is studied by ANSYS considering the heat transfer characters between fluid and solid. The experiment of temperature for hybrid journal bearing system in super high speed grinding machine is also performed. The thermal properties and the measure for controlling temperature rise of such bearings are analyzed.

Analysis of Thermal Properties of Super-High Speed Hybrid Journal Bearing Based on ANSYS

Hybrid journal bearings are used in the high and super high speed cases mainly, such as the super-high speed spindle system. Since the bearing operates under high speed conditions, the excessive temperature rise of the bearing is a major reason to lower the accuracy of the main shaft system and limit the bearings working speed higher, as a result, restrict the bearing applications. In this paper, the thermal properties and the heat mechanism of such bearings are analyzed. The mathematical model of hybrid journal bearing is established to analyze the mechanism of generating heat. In addition, the temperature field distribution for the certain hybrid journal bearing at speed of 10000 rpm is studied by means of software ANSYS considering the heat transfer characters between fluid and solid. An improved measure about temperature rise of hybrid journal bearing is presented.