LAMINAR FLOW HEAT TRANSFER IN HELICAL OVAL-TWISTED TUBE FOR HEAT EXCHANGER APPLICATIONS

Scott Wahlquist; Amir Ali; Su Jong Yoon; Piyush Sabharwall

doi:10.5098/hmt.18.35

LAMINAR FLOW HEAT TRANSFER IN HELICAL OVAL-TWISTED TUBE FOR HEAT EXCHANGER APPLICATIONS

Scott Wahlquist
, Amir Ali
, Su Jong Yoon
, Piyush Sabharwall

Nuclear Reactor Technology

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

The heat transfer performance of a novel tube configuration that combines the swirling velocity induced by oval-twisting and secondary flow generated by a helical geometrical flow path is presented. The Nusselt number (Nu) and friction factor (f) are compared for the laminar flow regime (Re = 250-2000) under isothermal wall conditions. Under the same flow and boundary conditions, the oval-twisted helical tube increased the Nu and slightly increased the f over the circular helical tube. The best performance with the highest Nu and lowest f occurs at the coil curvature ratio (dh/D) of 0.17. The quantified enhancement performance factor (η) shows a 46 - 56% increase for the oval-twisted helical tube over the circular helical tube with dh/D = 0.17. Correlations for the Nu and f are developed and agreed with the numerical results: ± 6% and ± 5% for the Nu and 0066, respectively.

Original language	English
Article number	35
Journal	Frontiers in Heat and Mass Transfer
Volume	18
Early online date	2022
DOIs	https://doi.org/10.5098/hmt.18.35
State	Published - 2022

Keywords

Oval-twisted
advanced heat exchangers
enhancement performance factor
helical tube
vorticity

INL Publication Number

INL/JOU-21-65186
104032

Access to Document

10.5098/hmt.18.35

Cite this

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title = "LAMINAR FLOW HEAT TRANSFER IN HELICAL OVAL-TWISTED TUBE FOR HEAT EXCHANGER APPLICATIONS",

abstract = "The heat transfer performance of a novel tube configuration that combines the swirling velocity induced by oval-twisting and secondary flow generated by a helical geometrical flow path is presented. The Nusselt number (Nu) and friction factor (f) are compared for the laminar flow regime (Re = 250-2000) under isothermal wall conditions. Under the same flow and boundary conditions, the oval-twisted helical tube increased the Nu and slightly increased the f over the circular helical tube. The best performance with the highest Nu and lowest f occurs at the coil curvature ratio (dh/D) of 0.17. The quantified enhancement performance factor (η) shows a 46 - 56\% increase for the oval-twisted helical tube over the circular helical tube with dh/D = 0.17. Correlations for the Nu and f are developed and agreed with the numerical results: ± 6\% and ± 5\% for the Nu and 0066, respectively.",

keywords = "Oval-twisted, advanced heat exchangers, enhancement performance factor, helical tube, vorticity",

author = "Scott Wahlquist and Amir Ali and Yoon, \{Su Jong\} and Piyush Sabharwall",

note = "Funding Information: The Idaho State University and Center of Advanced Energy Studies sponsored and funded this research through ISU-CAES small grant funding program. This research used the High-Performance Computing Center resources at Idaho National Laboratory, supported by the Office of Nuclear Energy of the US Department of Energy and a Nuclear Science User Facility. Publisher Copyright: {\textcopyright} 2022, Global Digital Central. All rights reserved.",

year = "2022",

doi = "10.5098/hmt.18.35",

language = "English",

volume = "18",

journal = "Frontiers in Heat and Mass Transfer",

issn = "2151-8629",

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T1 - LAMINAR FLOW HEAT TRANSFER IN HELICAL OVAL-TWISTED TUBE FOR HEAT EXCHANGER APPLICATIONS

AU - Wahlquist, Scott

AU - Ali, Amir

AU - Yoon, Su Jong

AU - Sabharwall, Piyush

N1 - Funding Information: The Idaho State University and Center of Advanced Energy Studies sponsored and funded this research through ISU-CAES small grant funding program. This research used the High-Performance Computing Center resources at Idaho National Laboratory, supported by the Office of Nuclear Energy of the US Department of Energy and a Nuclear Science User Facility. Publisher Copyright: © 2022, Global Digital Central. All rights reserved.

PY - 2022

Y1 - 2022

N2 - The heat transfer performance of a novel tube configuration that combines the swirling velocity induced by oval-twisting and secondary flow generated by a helical geometrical flow path is presented. The Nusselt number (Nu) and friction factor (f) are compared for the laminar flow regime (Re = 250-2000) under isothermal wall conditions. Under the same flow and boundary conditions, the oval-twisted helical tube increased the Nu and slightly increased the f over the circular helical tube. The best performance with the highest Nu and lowest f occurs at the coil curvature ratio (dh/D) of 0.17. The quantified enhancement performance factor (η) shows a 46 - 56% increase for the oval-twisted helical tube over the circular helical tube with dh/D = 0.17. Correlations for the Nu and f are developed and agreed with the numerical results: ± 6% and ± 5% for the Nu and 0066, respectively.

AB - The heat transfer performance of a novel tube configuration that combines the swirling velocity induced by oval-twisting and secondary flow generated by a helical geometrical flow path is presented. The Nusselt number (Nu) and friction factor (f) are compared for the laminar flow regime (Re = 250-2000) under isothermal wall conditions. Under the same flow and boundary conditions, the oval-twisted helical tube increased the Nu and slightly increased the f over the circular helical tube. The best performance with the highest Nu and lowest f occurs at the coil curvature ratio (dh/D) of 0.17. The quantified enhancement performance factor (η) shows a 46 - 56% increase for the oval-twisted helical tube over the circular helical tube with dh/D = 0.17. Correlations for the Nu and f are developed and agreed with the numerical results: ± 6% and ± 5% for the Nu and 0066, respectively.

KW - Oval-twisted

KW - advanced heat exchangers

KW - enhancement performance factor

KW - helical tube

KW - vorticity

UR - https://www.scopus.com/pages/publications/85135942356

U2 - 10.5098/hmt.18.35

DO - 10.5098/hmt.18.35

M3 - Article

AN - SCOPUS:85135942356

SN - 2151-8629

VL - 18

JO - Frontiers in Heat and Mass Transfer

JF - Frontiers in Heat and Mass Transfer

M1 - 35

ER -

LAMINAR FLOW HEAT TRANSFER IN HELICAL OVAL-TWISTED TUBE FOR HEAT EXCHANGER APPLICATIONS

Abstract

Keywords

INL Publication Number

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