Papers by Prof. Dr. Saad El-Sayed
This study concentrates on pelletization of powdered corn cob and wheat dust with 40% Epoxy binde... more This study concentrates on pelletization of powdered corn cob and wheat dust with 40% Epoxy binder. Two cylindrical pellets of different sizes and a new hexagonal one were investigated in this work. By densification process, the bulk density increased 8-10 times, having its maximum value fora hexagonal shape (new shape). It was found that the compressive resistance, the water resistance and the impact resistance of the pellets were in general higher for pellets produced at higher pressure. It was found that due to the binder and pelletization, the fuel quality was enhanced compared to the raw biomass as: the moisture content decreased, both fixed carbon and carbon contents increased, ash content reduced, oxygen content decreased and higher heating value (H.H.V) increased. Scanning Electron Microscopy was used to identify the binding mechanism of biomass dust particles in pellets. Pelletization process had improved combustion characteristics compared to raw biomass as: high combustion temperature ranges [T_onset becomes lower and T_offset becomes higher], maximum weight loss rates decreased and reduced residues which leads to a higher combustion efficiency. The analysis of ash yields of combustion process was investigated. It was found that the fouling index (FI) and slagging index (SI) tendency of wheat dust pellets are higher than that of corn cob pellets.
Estimation of Thermal and Kinetic Parameters of Sugarcane Bagasse and Cotton Stalks Dust Layers From Hot Surface Ignition Tests
Combustion Science and Technology, 2016
• Abdel Salam M.S., El-Asfoury A.S. and Saad A. El-Sayed, “Heat transfer between an air stream and flat late inclined to it”, Scientific Bulletin of Faculty of Eng. Cairo University, pp159-177, 1984
• Shouman A.R. and Saad A. El-Sayed, “Criticality conditions for thermal explosion with reactant consumption and various degrees of reaction”, Int. Symposium on pyrotechnics and explosives, Beijing, China, PP 665-700, 1987
• Saad A. El-Sayed, “Explosion characteristics of autocatalytic reaction”, Combustion and Flame, Vol. 133, N0. 3, pp 211-213, 2003
Combustion and Flame
• Saad A. El-Sayed, “Ignition characteristics of metal ignition in the thermal explosion theory”, J. Loss Prev. Process Ind. (JLPP), Vol. 9, No. 6, pp 393-400, 1996
Journal of Loss Prevention in the Process Industries
Smoldering combustion of rice husk dusts on a hot surface
Combustion Explosion and Shock Waves
ABSTRACT
• Saad A. El-Sayed, “Explosion Characteristics of a Volatile Explosive” The Open Thermodynamics Journal, Vol 7, pp. 88-102, 2013
The Open Thermodynamics Journal
1. Saad A. El-Sayed and M.E. Mostafa, “Thermal Analysis and Kinetic Parameters Determination of Biomass Pyrolysis Using (TGA/DTG) and (DTA) at different heating rates, accepted for publication in Waste and Biomass Valorization Journal in 19/2/2015
Waste and Biomass Valorization
ABSTRACT
• Saad A. El-Sayed et al, “Experimental Study of Heat Transfer to Flowing Air inside a Circular Tube with Longitudinal Continuous and Interrupted Fins” Journal of Electronics Cooling and Thermal Control, 2012, 2, 1-16
Ignition Characteristics for Thermal Runaways of Hazard Chemical Reactions of Different Degree of Reactions
ABSTRACT
• Saad A. El-Sayed and T. M. Khass, “Smoldering Combustion of Rice Husk Dusts on a Hot Surface” Combustion, Explosion, and Shock Waves, Vol.49, No.2, pp. 159 – 166, 2013. Original Russian Textc S.A. El-Sayed, T.M. Khass
Combustion Explosion and Shock Waves
ANALYSIS OF GRAIN SIZE STATISTIC AND PARTICLE SIZE DISTRIBUTION OF BIOMASS POWDERS. Accepted for publication in Waste and Biomass Valorization journal 2014
Waste and Biomass Valorization
ABSTRACT
Effect of heating rate on the chemical kinetics of different biomass pyrolysis materials
Biofuels
ABSTRACT
Effect of heating rate on the chemical kinetics of different biomass pyrolysis materials
Biofuels, 2015
ABSTRACT
Journal of Electronics Cooling and Thermal Control, 2012
Experimental investigations have been performed to determine the detailed module-by-module pressu... more Experimental investigations have been performed to determine the detailed module-by-module pressure drop and heat transfer coefficient of turbulent flow inside a circular finned tube. The tubes are provided with longitudinal fins continuous or interrupted in the stream wise direction by arranging them both in a staggered and in-line manner. Experiments are carried out for two different fin geometries, with two numbers of fins (N = 6 and 12). All tested finned tubes have 16 modules each with length equal to the tube diameter (L = D = 30 mm). The thermal boundary condition considered here, is a uniform heat flux. The module-by-module heat transfer coefficient is found to vary only in the first modules, and then attained a constant thermally periodic fully developed value after eight to twelve modules. The results also showed that in the periodic hydrodynamic fully developed region, the value of the pressure drop along the tube with continuous fins is greater than that of the in-line arrangement, and lower than that of the staggered arrangement. Furthermore, the results showed that in the periodic fully developed region, the tube with continuous fins produces a greater value of the heat transfer coefficients than that the tube with interrupted fins, especially through a high range of Reynolds number (5 × 10 4 > Re > 2 × 10 4 ). The tube with Staggered arrangement of fins produces a greater value of the heat transfer coefficient than the tube with continuous fins and the in-line arrangement finned tube at low Reynolds number (Re < 1.2 × 10 4 ).). It was found that the fins efficiency is greater than 90 percent; in the worst case (maximum Reynolds number with continuous fins tube).
Kinetic Parameters Determination of Biomass Pyrolysis Fuels Using TGA and DTA Techniques
Waste and Biomass Valorization, 2015
ABSTRACT
Analysis of Grain Size Statistic and Particle Size Distribution of Biomass Powders
Waste and Biomass Valorization, 2014
ABSTRACT
Experimental study of turbulent flow inside a circular tube with longitudinal interrupted fins in the streamwise direction
Experimental Thermal and Fluid Science, 1997
Experiments were performed to determine the detailed module-by-module pressure drop characteristi... more Experiments were performed to determine the detailed module-by-module pressure drop characteristics of turbulent flow inside circular finned tubes. The tubes were equipped with longitudinal fins interrupted in the streamwise direction by their arrangement in both a staggered and an inline manner. Experiments were carried out for two different fin geometries with hydraulic diameters Dh = 14.89 and 13.46 mm, two
The kinetics of the thermal decomposition of the two biomass materials (sugarcane bagasse and cot... more The kinetics of the thermal decomposition of the two biomass materials (sugarcane bagasse and cotton stalks powders) were evaluated using a differential thermo-gravimetric analyzer under a non-isothermal condition. Two distinct reaction zones were observed for the two biomasses. The direct Arrhenius plot method and the integral method were applied for determination of kinetic parameters: activation energy, pre-exponential factor, and order of reaction. The weight loss curve showed that pyrolysis of sugarcane bagasse and cotton stalks took place mainly in the range of 200–500 °C. The activation energy of the sugarcane bagasse powder obtained by the direct Arrhenius plot method ranged between 43 and 53.5 kJ/mol. On the other side, the integral method shows larger values of activation energy (77–87.7 kJ/mol). The activation energy of the cotton stalks powder obtained by the direct Arrhenius plot method was ranged between 98.5 and 100.2 kJ/mol, but the integral method shows larger values of activation energy (72.5–127.8 kJ/mol).
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Papers by Prof. Dr. Saad El-Sayed