Investigating Granular Milling In A
Hammer Mill: Experiments And Simulation
Author(s)
S. Naik and B. Chaudhuri
Abstract
Particle size reduction of dry material by milling is a key unit operation for the
pharmaceutical, agricultural, food and paper industries. Knowledge of particle
flow and size reduction in a hammer mill is thus critical to optimize the design
and operation of such equipment. Milling experiments are performed using
lactose non pareils in a laboratory scale Hammer Mill. The size and shape of the
resultant progeny of particles are analyzed by sieves/light scattering and
microscope/image analysis techniques respectively. Discrete Element Method
(DEM) based computational methods are developed to perform a quantitative
examination of granular flow, fracturing and subsequently fragmentation patterns
for the same hammer mill. A parametric study was performed to understand the
effect of hammer speed (rotational), feed rate, hammer-wall tolerance on size
reduction process. Simulations were carried out to study the effect of mill speed
on kinetic energy of particles.
Keywords: discrete element method, granular flow, fragmentation, hammer mill.
1 Introduction
Particle size reduction of dry granular material by mechanical means, also known
as milling or communition, is undoubtedly a very important unit operation in
pharmaceutical, agricultural, food, mineral and paper industries. For example,
particle size reduction has a significant impact on pharmaceutical product
performance and stability as it affects the solubility and bioavailability of many
poorly soluble BCS Class II drugs [1]. The most commonly used mills are the
rotary cutter, hammer mill, roller mill, ball mills and fluid energy mills, used in
various stages of manufacturing. Size reduction is generally achieved by particle
Keywords
discrete element method, granular flow, fragmentation, hammer mill
Related Book
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