Influence of particle-particle, interactions of fluid-to-particle heat transfer coefficients (h(fp)) under tube flow conditions using stationary particle technique

Tewari, G Jayas, DS

G. Tewari et Ds. Jayas, Influence of particle-particle, interactions of fluid-to-particle heat transfer coefficients (h(fp)) under tube flow conditions using stationary particle technique, J FD SCI M, 38(3), 2001, pp. 243-247

25

INGLESE

Article

Food Science/Nutrition

JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE

0022-1155 → ACNP

38

3

2001

243 - 247

ISI

0022-1155(200105/06)38:3<243:IOPIOF>2.0.ZU;2-R

Fluid-to-particle heat transfer coefficients (h(fp)) were determined experi mentally during flow of fluid over one or more particles using "stationary particle technique". The effects of different process parameters (e.g., par ticle-particle interaction, carrier fluid viscosity, carrier fluid temperat ure and flow rate) on h(fp) were quantified. The h(fp) value for the sample particle (silicone sphere) decreased by 5-20%, when another particle at di fferent orientations (0 degrees, 30 degrees, 45 degrees and 60 degrees) was introduced upstream, whereas h(fp) values increased by 14%, when multiple particles were introduced upstream of the sample particle (flow rate = 5.2 x 10(-4)m(3)/s and fluid temperature = 73.6 degreesC). The h(fp) value decr eased three-folds with an increase in carrier fluid viscosity from 0.4 x 10 (-3) to 33.3 x 10(-3) Pa.s. The h(fp) values increased four- and two-folds with an increase in carrier fluid temperature (from 60 degrees to 80 degree s) and flow rate (from 0.27 10(-3) to 2.82 x 10(-3)m(3)/s), respectively.