The role of particle size distribution of suspended solids in defining the flow properties of milk chocolate

Gagan Mongia, Gregory R. Ziegler

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

The flow characteristics of molten milk chocolate, like most dense suspensions, are a function of the maximum packing fraction (φm) of the suspended solids. Milk chocolates were prepared from mixtures of two relatively narrow coarse (d4,3 = 17 μm) and fine (d4,3 = 8.5 μm) size distributions of non-fat solids to contain 0, 25, 50, 75, and 100% of the coarse component. Solids bed density (a measure of maximum packing fraction) correlated with the apparent viscosity of milk chocolates (r = -0.98). The highest value for solids bed density and lowest value for apparent viscosity were measured for size distributions with 75% of solids from the coarse fraction. Casson yield value correlated with d4,3 (r = -0.98) and specific surface area (r = 0.93). The maximum packing fraction of binary mixtures of two distinct sizes of non-fat chocolate solids attained a maximum value for a specific volume ratio of the components. The maximum in φm corresponded with the minimum viscosity in molten chocolate at a given solids volume concentration.

Original languageEnglish (US)
Pages (from-to)137-147
Number of pages11
JournalInternational Journal of Food Properties
Volume3
Issue number1
DOIs
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Food Science

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