Abstract
A visualization study of the internal flow patterns of a closedâloop oscillating heat-pipe with check valves (CLOHP/CV) at normal operating condition for several evaporator lengths (Le), and ratio of check valves to number of turns (Rcv) has been conducted. This article describes the effects of varying Le, and Rcv on flow patterns. The CLOHP/CV used a Pyrex glass tube with inside diameter of 2.4 mm. The evaporator length of 50 and 150 mm. (the lengths of evaporator, adiabatic and condenser were equal) were employed with 10 turns, with Rcv of 0.2 and 1. R123 was used as the working fluid with filling ratio of 50% of internal volume of tube. It was found that the internal flow patterns could be classified according to the Le and Rcv as follows: At the high heat source when the Le decreases the main flow changes from the bubble flow with slug flow to disperse bubble flow. The Rcv decreases the main flow changes from the disperse bubble flow with bubble flow to disperse bubble When the velocity of slug increases, the length of vapor bubbles rapidly decreases and the heat flux rapidly increases.
Highlights
Over the past few years, there has been rapid development of practical engineering solutions to a multitude of heating problems
Akachi et al.[1] has invented a new type of heat made of a capillary tube that has been applied to cool small electronic devices
The vapor bubble length was measured as the length of the two ends of vapor at a specified time
Summary
Over the past few years, there has been rapid development of practical engineering solutions to a multitude of heating problems. Heat is transported from the evaporator to the condenser by the oscillation of the working fluid moving in an axial direction inside the tube In this type of system the inner diameter of the pipe is important. Akachi et al.[1] has invented a new type of heat made of a capillary tube that has been applied to cool small electronic devices. This new type of heat pipe is called an oscillating heat pipe (OHP), and has the same basic operational principle as that of the oscillating movement of the fluid and phase change phenomena. A capillary tube is bent into many meandering turns and closed at both ends
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