Effect of acoustic field on heat transfer in a sound assisted fluidized bed of fine powders

Heat Transfer in Sound Assisted Fluidized Bed of Fine Powders : A Review

“…Based on the physical property, nano particle indicates Geldart group C [1]. These particles have large forces of attraction in between them and are very complicated to separate out easily with conventional gas fluidization process [4]. The additional force, hence, is required for nano powders to acquire effective applications.…”

“…Like this, sound assisted fluidized bed of nano powders improves the quality of fluidization process [6] and results more turbulence in the bed and sufficient degree of homogeneity [12]. In case of more heat transfer coefficient in this fluidized bed, quick movement of the particles is necessary and hence for this purpose, gas velocity is made to increase with required contact time of them [4,21].…”

Effect of acoustic field on minimum fluidization velocity and drying characteristics of lignite in a fluidized bed

“…Obviously, sound waves with a high sound pressure level have relative greater force which disrupted effectively the inter-particle force. According to the energy balance equation in an acoustic fluidized bed [12], the sound waves energy increased and the agglomerate size decreased with the increasing sound pressure level. Thereby, acoustic fields provide an improvement in the ease of fluidization of lignite particles.…”

“…The results of David RE et al [10,11] showed that high frequency (sound) vibrations could decrease the minimum fluidization velocity and provide a more uniform fluidization. Wankhede US et al [12] found that acoustic energy of sufficient intensity and sound pressure level significantly improved the quality of fluidization of fine powders and heat transfer rates. In addition, Guo QJ et al [13] reported the influence of sound waves on fluidization of quartz sand and SiO 2 particles in high temperature fluidized bed.…”

Heat Transfer Enhancement in a Stagnant Dielectric Liquid by the Up and Down Motion of Conductive Particles Induced by Coulomb Forces

“…Several external agents have been used by researchers for deriving and controlling the dispersed phase in the suspensions. Not all but a few are magnetic fields (Rawat et al, 2014), sound waves (Wankhede et al, 2011;Xu et al, 2006), container vibration (Bacelos et al, 2011) and mechanical stimulation (Siebert et al, 1999). The mentioned technique is often difficult to be implemented in practice due to a substantial problem of sedimentation of the dispersed micron-sized particles in the flow.…”