Dynamic interaction of heat transfer, air flow and disc vibration of disc drives — Theoretical development and numerical analysis

A thermal boundary control method for a flexible thin disk rotating over critical and supercritical speeds

“…As indicated theoretically and experimentally by references [25][26][27][28], for a free rotating disk with a fixed slider loading system and friction heat, without any influence from the surrounding air, the shaft temperature increment only decreases the natural frequencies of low frequency disk modes, such as (0, 0) and (0, 1), and can cause thermoelastic instability for high shaft temperature increments, as presented by Pei et al [27].…”

“…From Ouyang and Mottershead [6,9] and Pei et al [10,[27][28][29]37], the governing equation of transversal vibration [30,31] for the rotating thermoelastic disk subjected to the stationary slider loading system with interface friction can be written as…”

“…where σr and σθ are the disk membrane stress resultants [4,10,32]; cL denotes the lift force induced by the rotating surround air as indicated by Yasuda et al [11] and Lee et al [12]; Φ is a partial stress function that excludes the stress induced by disk rotation [28,37]…”

“…From references [27,28] for the transversally symmetric temperature increment Θ(z)=Θ(-z), the solution of Eq. (5) can be assumed to be…”

Mathematical Modelling of MHD Double – Diffusive Natural Convection Flow in a Square Enclosure

“…Natural convective fluid flows, heat and mass transfer has been receiving the considerable attention based on diverse fields in engineering and industrial applications including the wire electrodischarge machining (Murphy KD et al, 2000;Lambert TA et al, 2002), aerodynamic heating of air flow (Pei YC et al, 2014), magnetic systems (Ghasemia et al, 2011), liquid metal systems (Kakarantzas et al, 2014), thermal energy storage systems, chemical processes and drying technology etc. Based on the enormous expansion of the applicability of convection, the researchers are continuously exploring the convective heat and mass transfer effects on double-diffusive convection (Mchirgui et al, 2012), Magnetohydrodynamic convection under different thermosolutal boundaries.…”