Document Type
Journal Article
Publication Title
Case Studies in Thermal Engineering
Volume
53
Publisher
Elsevier
School
School of Engineering
RAS ID
64733
Abstract
The use of helical tubes in heat transfer appliances is desirable due to their better heat transfer characteristics, but the higher pressure drop decreases the overall performance. The variation of pitch design of a helical tube is proposed to alleviate this situation so that the pitch number does not remain constant in the total tube length. A total of six variable pitch numbers with three different diameters are proposed and investigated on the thermal and fluid characteristics. To better understand the helical tube efficiency, PEC (performance evaluation criteria) is selected as a performance indicator in the present work and simulations are performed in a laminar regime (100 ≤ Re ≤ 1600) at a constant heat flux boundary condition using computational fluid dynamics. The numerical results show that variable radial pitch has higher effects on the overall performance than variable axial pitch, and it can intensify the helical tube performance by up to 10%. The results also indicate that increasing the tube diameter leads to heat transfer and friction factor increment while increasing the Reynolds number deteriorates the overall performance.
DOI
10.1016/j.csite.2023.103944
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Comments
Pourhemmati, S., Mohammed, H. A., & Shafieian, A. (2024). The use of variable coil pitch of helical tube on the hydro-thermal performance improvement. Case Studies in Thermal Engineering, 53, article 103944. https://doi.org/10.1016/j.csite.2023.103944