Temperature fluctuations of discrete particles in a homogeneous turbulent flow: a Lagrangian model

✍ Scribed by S. Moissette; B. Oesterlé; P. Boulet

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 270 KB
• Volume: 22
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(01)00083-2

✦ Synopsis

Within the frame of Lagrangian approaches for the prediction of heat transfer in dispersed two-phase ¯ows, a new dispersion model is proposed which involves correlated stochastic processes to predict the velocity and temperature of a discrete particle along its path in terms of the instantaneous velocity and temperature of the surrounding ¯uid element. The dispersion problem is carefully addressed in taking into account the anisotropy of the ¯ow and the turbulent heat ¯ux resulting from velocity±temperature correlations. The model is used to simulate the behavior of particles suspended in a homogeneous turbulent shear ¯ow. The numerically predicted correlations between the ¯uctuating quantities are in perfect agreement with the results of an analytical study by Zaichik (Phys. Fluids 11 (1999) 1521±1534). A supplementary investigation of the associated eects of non-linear drag and heat transfer is then proposed.