Salman, Y. K., & Mohammed, H. A. (2007). Free Convective Heat Transfer with Different Sections Lengths Placed at the Exit of a Vertical Circular Tube subjected to a Constant Heat Flux. Al-Khwarizmi Engineering Journal, 3(3), 31-52. https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/631