SIMULATION STUDY ON THE EFFECT OF INTERNAL PRESSURE IN ISRCTs COMPARED WITH FLUID MANDREL DRAWING METHOD

Abstract

The objective of this research paper is to identify the effect of internal pressure deformation behaviours of ribbed spiral angle and the ribbed cross-sectional profile of ultra-small inner spiral ribbed copper tubes (ISRCTs) which have high quality and efficiency in transferring heat. Modelling and simulation techniques were performed by using commercial Abaqus software to observe whether the surface profiles of the ISRCTs was increased or decreased with various internal pressures (pressure gauge: 0, 1, 2 and 3 bar) on the tube drawing. The effect of any parameters cannot be found by experimental method. Twelve multi-passes drawing with internal pressures 0, 1, 2 and 3 bar was summarised and compared to the fluid mandrel drawing in similar to 1-3 multi-pass drawing, 4-6 multi-pass drawing, 7-9 multi-pass drawing, and 10-12 multi-pass drawing respectively. In various internal pressures, the FEM simulation approach was used to analyse the changes of ten parameters: von Mises stress, wall thickness, ribbed base width, ribbed tip width, ribbed base gap, ribbed tip gap, ribbed height, ribbed pitch, axial displacement and ribbed spiral angle. The results will be very valuable for researchers and well engineers for future design of ultra-small ISRCT to improve the quality and efficiency of heat transfer.