Abstract
Turbulent field induced by combined action of mechanical and thermal stirring is experimentally investigated. Turbulence is generated by means of an oscillating grid and plate heater both of which are installed at the bottom of a one-dimensional test tank. Dynamic effect of mechanical and thermal stirring on turbulent structure is examined by measuring fluctuating components of temperature and velocity. Temperature fluctuation decreases with increasing the relative intensity of mechanical stirring to thermal stirring. However, turbulent velocity is scarcely affected by the thermal stirring, in other words, the mechanical stirring dominates the fluctuating velocity field.
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