Milk fouling simulation in helical triple tube heat exchanger

Abstract Heat exchanger fouling is a common phenomenon during high temperature processing of milk. The temperature of milk raises from 90 °C to 150 °C during Ultra-High-Temperature (UHT) sterilization process. At such high temperature, the minerals and denatured proteins deposit on the heat exchanger surface, also known as fouling. Fouling acts as resistance to heat transfer, hence the performance of the heat exchanger is reduced. Using hydrodynamics and heat balance concept, a mathematical model was formulated. Simulation was performed with the model to predict the fouling behavior as a function of time and position within the helical triple tube heat exchanger (HTTHE). At an early period of operation, the uniform fouling deposit occurs throughout the length of the heat exchanger due to constant heat exchanger wall temperature. With progress of time, the fouling deposit and also Biot number (i.e., local fouling factor) increases towards the outlet of the heat exchanger since the interface temperature between fouling deposit and milk approaches towards the bulk milk temperature, that increases towards the heat exchanger outlet. The fouling deposit stabilizes after 105 min since no net deposit occurs after that time.

[1]  T. Jeurnink.  Fouling of heat exchangers by fresh and reconstituted milk and the influence of air bubbles , 1995 .

[2]  Nicholas P. Chopey,et al.  Handbook of Chemical Engineering Calculations , 2003 .

[3]  J. C. Leuliet,et al.  A reaction engineering approach to the analysis of fouling by whey proteins of a six-channels-per-pass plate heat exchanger , 1997 .

[4]  K. Swartzel.  Tubular Heat Exchanger Fouling by Milk During Ultra High Temperature Processing , 1983 .

[5]  H. Burton.  Ultra-High-Temperature Processing of Milk and Milk Products , 1989 .

[6]  Donald Quentin Kern,et al.  Process heat transfer , 1950 .

[7]  R. K. Singh,et al.  Energy increases in operation and cleaning due to heat-exchanger fouling in milk pasteurization , 1991 .

[8]  Andreas Acrivos,et al.  Method of Characteristics Technique. Application to Heat and Mass Transfer Problems , 1956 .

[9]  Peter J. Fryer,et al.  Heat exchanger fouling: A model study of the scaleup of laboratory data , 1995 .

[10]  C. Zuritz.  ON the DESIGN of TRIPLE CONCENTRIC‐TUBE HEAT EXCHANGERS , 1990 .

[11]  D. B. Lund,et al.  COMPARISON of TWO OPERATING METHODS of A PLATE HEAT EXCHANGER UNDER CONSTANT HEAT FLUX CONDITION and THEIR EFFECT ON the TEMPERATURE PROFILE DURING MILK FOULING , 1994 .

[12]  Peter J. Fryer,et al.  Engineering and chemical factors associated with fouling and cleaning in milk processing , 1997 .

[13]  T. Jeurnink,et al.  Fouling of heat exchangers in the dairy industry , 1997 .

[14]  Peter J. Fryer,et al.  A direct simulation procedure for chemical reaction fouling in heat exchangers , 1985 .

[15]  C. Geankoplis.  Transport processes and unit operations , 1978 .