Internal flow Patterns of the Horizontal Heat Mode Closed-Loop Oscillating Heat Pipe with Check Valves (HHMCLOHP/CV)

S Rittidech,S Sangiamsuk

doi:10.19026/rjaset.5.5033

Abstract

This research was to study the internal flow patterns on heat transfer rates of the Horizontal Heat Mode Closed Loop Oscillating Heat Pipe with Check Valves (HHMCLOHP/CV). The HHMCLOHP/CV was made from a Pyrex glass capillary tube with a 2.4 mm inside diameter. There were 10 meandering turns with 2 check valves. Ethanol and a silver nano-ethanol mixture were used as working fluid. Experimental results found that if working fluid varies from ethanol to a silver nano-ethanol mixture and the evaporator temperature increases the main flow patterns were Slug flow + Annular flow. The main regime of each flow pattern can be determined from the flow pattern map.

Highlights

The Oscillating/Pulsating Heat Pipe (OHP/PHP), first proposed is one type of heat transfer device (Akachi et al, 1996)
The internal flow patterns of HHMCLOHP/CV were recorded by video camera and digital camera at specific times
The internal flow patterns show the relationship between effect of working fluids, evaporator lengths and the evaporator temperatures

Summary

Introduction

The Oscillating/Pulsating Heat Pipe (OHP/PHP), first proposed is one type of heat transfer device (Akachi et al, 1996). The Closed-Loop Oscillating Heat Pipe with Check Valves (CLOHP/CV) is a new type of heat transfer device. The principle is the transfer of the latent heat of the working fluid inside the tubes, which evaporates heat from a heat source at the evaporator section and the heat transfers by condensation to the condenser section. Due to the fact that the latent heat of vaporization of the working fluid is very high, it transfers heat from the evaporator section to the condenser section by a slight temperature difference. In the present experiment the Horizontal Heat Mode Closed-Loop Oscillating Heat Pipe with Check Valves (HHMCLOHP/CV) as shown in Fig. 1 was evaluated.

Methods

Results

Conclusion