Heat convection from a sphere placed in an oscillating free stream

Effect of fixed bed characteristics on the performance of pulsed water flow humidification-dehumidification solar desalination unit

“…This fact promotes the use of multi-stage air heater and humidifier combinations to increase the fresh water production. The application of pulsation or reciprocation has been recognized as an effective process intensification technique that enhances mass and heat transfer rates, and improves both process productivity and product quality [5][6][7][8][9][10]. Different studies have presented experimental, analytical and numerical investigations on the effect of pulsation on heat transfer characteristics [11][12][13][14][15][16][17][18].…”

Measurement and prediction of the cooling characteristics of a generalized vibrating piezoelectric fan

“…Understanding the effect of vibration is critical in two-phase nuclear reactors [1,2] as well as in heat exchangers [3][4][5] where vibration is driven by an engine or compressor. Thermal characteristics of heated objects oscillating in a fluid have also been studied, and have included geometries that are spherical [6,7], cylindrical [8,9], or flat-plate [10,11]. Each of these studies [1][2][3][4][5][6][7][8][9][10][11] has reported heat transfer enhancements over baseline natural or forced convection conditions.…”

“…Thermal characteristics of heated objects oscillating in a fluid have also been studied, and have included geometries that are spherical [6,7], cylindrical [8,9], or flat-plate [10,11]. Each of these studies [1][2][3][4][5][6][7][8][9][10][11] has reported heat transfer enhancements over baseline natural or forced convection conditions. The similarities may be noted between past studies of a flat heated surface oscillating in a fluid and an unheated beam oscillating past a flat stationary heated surface, the situation encountered with a piezoelectric fan.…”

Heat convection from a sphere placed in a fluctuating free stream

“…These studies, however, deal with forced convection, and the effect of gravity is never considered. Alassar et al29 considered mixed convection (both forced and free) from a sphere in a purely oscillating vertical free‐stream. As the free‐stream considered was purely oscillating (about a zero mean), the parameters considered were Reynolds number, Grashof number, and Strouhal number.…”

“…The study of Alassar et al29 considers a purely oscillating free‐stream; that is, the oscillations are about a zero‐mean velocity. This article investigates the effect of the free‐stream fluctuations about a nonzero mean on the heat transfer from a sphere with buoyancy forces taken into consideration.…”