Effect of Inner Diameter and Inclination Angles on Operation Limit of Closed-Loop Oscillating Heat-Pipes with Check Valves

P Meena,P Tammasaeng,S Rittidech

doi:10.3844/ajeassp.2008.100.103

Abstract

This research was to study the effect of inner diameter and inclination angles on operation limit of a closed loop oscillating heat pipes with check valves (CLOHP/CV). A set of CLOHP/CV was made of copper tubes in combination of following dimension: 1.77 and 2.03 mm inside diameter: 10 turn, with R123 was used as the working fluid. The working fluid was filled in the tube at the filling ratio of 50%. The inclination angles were 0, 20, 40, 60, 80 and 90° with 5 equal lengths for evaporator, adiabatic and condenser sections. The evaporator section was given heat by heater while the condenser section was cooled by volume water in a cold bath. The adiabatic section was properly insulated. In the test operation, it could be concluded as follows. It indicated that when the inner diameter changed from 1.77-2.03 mm the critical temperature increased. And when increase the inclination angles from 0 until to 90° the critical temperature increased.

Highlights

Condenser QoutThe CLOHP/CV is widely accepted as the most efficient heat transfer device
The check valve is a floating type valve that consists of a stainless ball and copper tube, in which ball stopper and conical valves seat are provided at the ends, respectively
Rittidech et al.[7] studies the effect of evaporator lengths and ratio of check valves to number of turns on internal flow patterns of a used with type K thermocouples (Omega with ±1°C accuracy) attached to the inlet and outlet of the cooling jacket, thermocouples were attached to the outside surface wall of the CLOHP/CV and data were recorded

Summary

INTRODUCTION

The ball can move freely between the ball stopper and the valves seat To study the effect of inner diameter on operation limit of a closed loop oscillating heat pipes with check valve. To study the effect of inclination angles on operation limit of a closed loop oscillating heat pipes with check valve. The ball can move freely between the ball stopper and the valves seat in shown Fig. 3

MATERIALS AND METHODS

AND DISCUSSION

CONCLUSIONS