"Heat transfer by natural convection in horizontal annuli" The eight international conference for Mechanical Power Engineering, Alexandria University, pp. 153-165, April 27-29. "Spray characteristics of an Airblast-simplex Nozzle Liquid-Fueled Gas Turbine Combustors", presented at the ASME International Gas Turbine and Aeroengine Congress & Exhibtion , Stckholm, Sweeden. "Heat transfer by natural convection in vertical and horizontal annuli" Al–Azhar University Engineering Journal, Vol.4, No. 4, Cairo, Egypt, (October ) . "An experimental study of fluid flow characteristics around semi-circular tube" 10th International conference on applied Mechanics and Mechanical Engineering, May 14-16, Milatary Technical College, Cairo, Egypt. "Experimental investigation of free convection from a horizontal semicircular cylinder at different orientations" Journal of Engineering Science, Assiut University, Vol. 30, No. 3, pp. 731-744, July. "Experimental investigation of natural convection inside horizontal elliptic tube with different angles of attack" published in Cairo International Conference on Energy and Environment, 4-7. “Free convection from a vertical and inclined semicircular cylinder at different orientations” Alexandria Engineering Journal, Vol. 42, No. 3, pp. 273-282, May . “Experimental investigation of natural convection from vertical and horizontal helicoidal pipes in HVAC application” ASHRAE Conference Cairo-Egypt, 6-8 Sept. "Free convection in tilted rectangular enclosures heated at the bottom wall and vented by different slot-vented arrangements" Sci. Bull. Fac. Eng. Ain Shams Univ., Vol. 39, No. 2, pp. 981- 998, June 30. "Heat transfer by free convection from the inside surface of the vertical and inclined elliptic tube" Sci. Bull. Fac. Eng. Ain Shams Univ., Sept. 30. "Heat transfer by free convection from isothermal vertical helical coiled tubes" 11th International Conference on Applied Mechanics and Mechanical Engineering (AMME), Nov. 23-25. " Thermal performance of a cross flow heat exchanger with semi-circular tubes" Engineering Research Journal, Shoubra Faculty of Eng. No. 4, pp. 87- 109. "Experimental and numerical investigation of natural convection between isothermal concentric and eccentric vertical cylinders" Engineering Research Journal; Helwan Univ., Faculty of Engineering, Mattaria, August. " Experimental and numerical study of flow field and forced convection around semi-circular tube in cross flow at different angles of attack" Sci. Bull. Fac. Eng. Ain Shams Univ. Faculty of Eng., Vol.40, No. 2, pp.651-676, June 30. "Thermal performance of a pipe in pipe heat exchanger with sinusoidal inner pipe" Energy Conversion and Management 49 678–686. " Free convection heat transfer inside vertical and inclined elliptic tubes with different axis ratio and different inclination and orientation angles" Energy Conversion and Management 49 587–595. "Heat transfer by natural convection in horizontal annuli" The eight international conference for Mechanical Power Engineering, Alexandria University, pp. 153-165, April 27-29. " Spray characteristics of an Airblast-simplex Nozzle Liquid-Fueled Gas Turbine Combustors", presented at the ASME International Gas Turbine and Aeroengine Congress & Exhibtion , Stckholm, Sweeden. "Heat transfer by natural convection in vertical and horizontal annuli" Al–Azhar University Engineering Journal, Vol.4, No. 4, Cairo, Egypt, (October ) . " An experimental study of fluid flow characteristics around semi-circular tube" 10th International conference on applied Mechanics and Mechanical Engineering, May 14-16, Milatary Technical College, Cairo, Egypt. "Experimental investigation of free convection from a horizontal semicircular cylinder at different orientations" Journal of Engineering Science, Assiut University, Vol. 30, No. 3, pp. 731-744, July. " Experimental investigation of natural convection inside horizontal elliptic tube with different angles of attack" published in Cairo International Conference on Energy and Environment, 4-7. “Free convection from a vertical and inclined semicircular cylinder at different orientations” Alexandria Engineering Journal, Vol. 42, No. 3, pp. 273-282, May. “Experimental investigation of natural convection from vertical and horizontal helicoidal pipes in HVAC application” ASHRAE Conference Cairo-Egypt, 6-8 Sept. "Free convection in tilted rectangular enclosures heated at the bottom wall and vented by different slot-vented arrangements" Sci. Bull. Fac. Eng. Ain Shams Univ., Vol. 39, No. 2, pp. 981- 998, June 30. "Heat transfer by free convection from the inside surface of the vertical and inclined elliptic tube" Sci. Bull. Fac. Eng. Ain Shams Univ., Sept. 30. "Heat transfer by free convection from isothermal vertical helical coiled tubes" 11th International Conference on Applied Mechanics and Mechanical Engineering (AMME), Nov. 23-25. " Thermal performance of a cross flow heat exchanger with semi-circular tubes" Engineering Research Journal, Shoubra Faculty of Eng. No. 4, pp. 87- 109. "Experimental and numerical investigation of natural convection between isothermal concentric and eccentric vertical cylinders" Engineering Research Journal; Helwan Univ., Faculty of Engineering, Mattaria, August. " Experimental and numerical study of flow field and forced convection around semi-circular tube in cross flow at different angles of attack" Sci. Bull. Fac. Eng. Ain Shams Univ. Faculty of Eng., Vol.40, No. 2, pp.651-676, June 30. "Thermal performance of a pipe in pipe heat exchanger with sinusoidal inner pipe" Energy Conversion and Management 49 678–686. " Free convection heat transfer inside vertical and inclined elliptic tubes with different axis ratio and different inclination and orientation angles" Energy Conversion and Management 49 587–595.