Heat transfer to suspensions of different grades of wood pulp fibres at dif
ferent concentrations were investigated over a range of flow rates. It was
observed that a small amount of fibre in suspension causes drag reduction a
nd reduces the heat transfer coefficient below that for water. Both effects
are a function of concentration, flow rate and fibre type. The more flexib
le fibres produce a greater level of drag reduction and a greater lowering
of heat transfer coefficient. The measurement of heat transfer coefficient
provides a method of comparing fibres of different flexibility for papermak
ing. (C) 1999 Elsevier Science S.A. All rights reserved.