Experimental and Numerical Investigation to Enhance the Performance of Helical Coiled Tube Heat Exchanger by Using Turbulators. J. eng. sustain. dev. 2014;18(6):1-16. تاريخ الوصول مايو 18, 2024. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/872