Gas velocity distribution in conical spouted beds with high-density particles

Doğan, Neslin
Külah, Görkem
Local gas velocity measurements were conducted utilizing a Pitot tube in two small-scale (D-c = 150 mm, gamma = 30 degrees, 60 degrees) and one large-scale (D-c = 250 mm, gamma = 66 degrees) conical spouted beds. Three different types of particles, zirconia (rho(p) = 6050 kg/m(3)), zirconia-toughened alumina (rho(p) = 3700 kg/m(3)), and glass beads (rho(p) = 2460 kg/m(3)), were used in the experiments. Careful calibration of the Pitot tube for determination of gas velocities in the annulus section was carried out in a separate, loosely packed-bed set-up, which represents the flow conditions in the annulus section of the spouted bed. Solids hold-up profiles were used to calculate the superficial gas velocities and determine the amount of air flowing through the spout, interface, and annulus. Effects of axial position, conical angle, bed size, and particle density on gas velocity profiles were investigated. It is shown that the amount of air flow through the annulus increases as the axial distance and particle density increases; however, it decreases with increasing cone angle. Dispersion of the gas into the annulus is found to be significantly higher in the large-scale unit than the small-scale unit.


Temperature- and excitation intensity-dependent photoluminescence in TlInSeS single crystals
Hasanlı, Nızamı; Yuksek, NS (2002-12-16)
Photoluminescence (PL) spectra of TlInSeS layered single crystals were investigated in the wavelength region 46.0-800 nm and in, the temperature range 10-65 K. We observed one wide PL band-centred at 584 nm (2.122 eV) at T = 10 K and an excitation intensity of 7.5 W cm(-2). We have also studied the variation of the PL intensity versus excitation laser intensity in the range from 0.023 to 7.5 W cm(-2). The red shift of this band with increasing temperature and blue shift with increasing laser excitation inte...
Surface-to-bed heat transfer for high-density particles in conical spouted and spout-fluid beds
Yaman, Onur; Külah, Görkem; KÖKSAL, MURAT (Elsevier BV, 2019-02-01)
Bed-to-surface heat transfer experiments from a vertically submerged cylindrical surface were conducted in laboratory-scale (D-c = 25 cm) conical spouted and spout-fluid beds at two different conical angles (31 degrees and 66 degrees) in the high particle density range (2500 kg/m(3) <= sigma(p) <= 6000 kg/m(3)). The effects of the bed design parameters (conical angle and inlet diameter of spouting gas entrance) and operating conditions (static bed height, particle size, density, and spouting and fluidizatio...
Gas source molecular beam epitaxy growth and characterization of Ga0.51In0.49P/InxGa1-xAs/GaAs modulation-doped field-effect transistor structures
Beşikci, Cengiz; Ozder, S; Sen, O; Jelen, C; Slivken, S; Razeghi, M (IOP Publishing, 1997-11-01)
Lattice-matched Ga0.51In0.49P/GaAs and strained Ga0.51In0.49P/InxGa1-xAs/GaAs (0.1 less than or equal to x less than or equal to 0.25) modulation-doped field-effect transistor structures were grown by gas source molecular beam epitaxy by using Si as dopant. Detailed electrical characterization results are presented, The Ga0.5In0.49P/In0.25Ga0.75As/GaAs sample yielded dark two-dimensional electron gas densities of 3.75 x 10(12) cm(-2) (300 K) and 2.3 x 10(12) cm(-2) (77 K) which are comparable to the highest...
Pressure dependence of the heat capacity near the melting point in benzene
Yurtseven, Hasan Hamit (2017-09-01)
The heat capacity C-p is calculated as a function of pressure at constant temperatures of 25, 40 and 51 degrees C for the solid and liquid phases of benzene near the melting point. For this calculation, the observed molar volume from the literature are used at various pressures for constant temperatures indicated through the thermodynamic relations in the solid and liquid phases of benzene near the melting point.
Merey, Sukru; Sınayuç, Çağlar (2016-09-01)
In this research, experimental adsorption measurements for a Dadas shale sample were conducted at various pressures (up to 13 790 kPa (2000 psia)) and temperatures (25, 50, and 75 degrees C) using pure methane (CH4). The effects of temperature and pressure on adsorption were observed. As pressure increases, CH4 adsorption increases. However, as temperature increases, CH4 adsorption decreases. Moreover, by using Langmuir isotherm and Ono-Kondo models, experimental adsorption results were evaluated and adsorp...
Citation Formats
N. Doğan, M. KÖKSAL, and G. Külah, “Gas velocity distribution in conical spouted beds with high-density particles,” CANADIAN JOURNAL OF CHEMICAL ENGINEERING, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: