Flow pattern assessment in tubes of reciprocating scraped surface heat exchangers

Numerical and experimental investigation of flow patterns in scraped surface heat exchangers

A numerical investigation of a scraped surface heat exchanger was undertaken using the commercial CFD code FLUENT in order to characterize the flow patterns for Newtonian and Non-Newtonian highly viscous fluids where experimental measurements are difficult to obtain. Simulation results were validated with experimental shear rates measured using electrochemical method (Mabit et al., 2003) as wel...

Analysis of heat flow and “channelling” in a scraped-surface heat exchanger

Scraped-surface heat exchangers (SSHEs) are widely used in industries that manufacture and thermally process fluids; in particular, the food industry makes great use of such devices. Current understanding of the heat flow and fluid dynamics in SSHEs is predominantly based on empirical evidence. In this study a theoretical approach (based on asymptotic analysis) is presented for analysing both t...

Measurement of flow field and local heat transfer distribution on a scraped heat exchanger crystalliser surface

In a cylindrical scraped heat exchanger crystallizer geometry the flow field influence on the local heat transfer distribution on an evenly cooled scraped heat exchanger surface has been studied by direct measurements of the heat exchanger surface temperature and the fluid velocity field inside the crystallizer. Liquid Crystal Thermometry revealed that the local heat transfer is higher in the m...

Performance Study of Scraped Surface Heat Exchanger with Helical Ribbons

Abstract—In this work, numerical simulations were carried out using a specific CFD code in order to study the performance of an innovative Scraped Surface Heat Exchanger (SSHE) with helical ribbons for Bingham fluids (threshold fluids). The resolution of threedimensional form of the conservation equations (continuity, momentum and energy equations) was carried out basing on the finite volume me...

Heat Transfer to Separation Flow in Heat Exchangers