"Experimental and Numerical Investigation to Enhance the Performance of Helical Coiled Tube Heat Exchanger by Using Turbulators". 2014. مجلة الهندسة والتنمية المستدامة 18 (6): 1-16. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/872.