Structural and thermal analysis of heat exchanger with tubes of elliptical shape

Abstract EN

An approach to select the tube wall thickness distribution of streamlined tubes intended for use in heat exchangers is developed in this study.

The main goal is to retain a streamlined outer profile (resist deformation) and to prevent strain failure due to the applied internal pressure.

The effect of the tube wall thickness distribution on shaped tube efficiency is also considered.

The strain is calculated as a function of several dimensionless geometric ratios and the ratio of the internal pressure to elastic material modulus.

Using the finite element method, a set of dimensionless design curves is created for elliptical tube geometries.

From these curves, a range of possible materials and tube geometries can be selected that meet a specific strain limit.

To illustrate the approach, structure-satisfied elliptical designs are selected and their thermal performance is evaluated for an automotive charge air cooler made of polymeric material.