Shokouhmand, Hossein, and Zeinab Montazerinejad. “Numerical Investigation of the Effect of Pitch Variation on the Flow Field, Pressure Distribution, and Heat Transfer Coefficient in a Vertical Double-Pipe Helical Heat Exchanger”. Mechanical Technology and Engineering Insights, vol. 3, no. 2, June 2026, pp. 133-4, https://doi.org/10.48313/mtei.v3i2.85.