Effect of Temperature on Rheological Behavior of Liquid Milk and Its Impact to Adequacy of Thermal Process

Eko Purnomo, Eko Purnomo, Ni Satyani

2019

Abstract

Temperature is one of the factors affecting fluid flow characteristics and the thermal adequacy in milk sterilization in an aseptic system. This research is aimed to study density and rheology of milk at temperature of 20-80 0C and its effect to Reynold number and thermal sterility. Four different kinds of commercial milk were used. The density and rheological properties were measured by using densitometer a Brookfield Viscometer DV II, respectively. The results showed that the milks were Newtonian. Temperature affected the density and viscosity of the liquid milk and consequently affected the Reynolds number. Increased temperatures lead to decreased density and decreased viscosity which could be well described using an Arrhenius model. Combined effect of increased temperature on decreased density and viscosity resulted in increased Reynolds numbers. This indicated that Reynolds number is more affected by the value of viscosity rather than density, as temperature increased. Under a full-scale production set up in one of the milk factories, the four kinds of liquid milk exhibited turbulent fluid flow properties (Reynolds number more than 4000). Therefore, decreased viscosity and density of milk at elevated temperature did not adversely affect adequacy of aseptic thermal process at a constant flow rate.

Paper Citation

in Harvard Style

Purnomo E. and Satyani N. (2019). Effect of Temperature on Rheological Behavior of Liquid Milk and Its Impact to Adequacy of Thermal Process. In Proceedings of the 2nd SEAFAST International Seminar - Volume 1: 2nd SIS, ISBN 978-989-758-466-4, pages 38-42. DOI: 10.5220/0009977900002833

in Bibtex Style

@conference{2nd sis19,
author={Eko Purnomo and Ni Satyani},
title={Effect of Temperature on Rheological Behavior of Liquid Milk and Its Impact to Adequacy of Thermal Process},
booktitle={Proceedings of the 2nd SEAFAST International Seminar - Volume 1: 2nd SIS,},
year={2019},
pages={38-42},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0009977900002833},
isbn={978-989-758-466-4},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 2nd SEAFAST International Seminar - Volume 1: 2nd SIS,
TI - Effect of Temperature on Rheological Behavior of Liquid Milk and Its Impact to Adequacy of Thermal Process
SN - 978-989-758-466-4
AU - Purnomo E.
AU - Satyani N.
PY - 2019
SP - 38
EP - 42
DO - 10.5220/0009977900002833