Spring-wire has been recently suggested as a turbulator for curved based helical and spiral tubes because of its flexibility nature. Spring-wire can be fabricated by twisting a wire around a rod. However. common circular wire is the only one normally employed in the fabrication process of the spring-wire while the outcomes of this research show that the other wire cross-section shapes... https://parisnaturalfoodes.shop/product-category/gum-cinnamon/