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Research Papers: Heat Transfer Enhancement

# Influence of Geometrical Parameters on Heat Transfer of Transversely Corrugated Helically Coiled Tube for Deicing Fluid

[+] Author and Article Information
Mengli Wu

College of Aeronautical Engineering,
Civil Aviation University of China,
Tianjin 300300, China
e-mail: mlwu@cauc.edu.cn

Qi Nie

College of Aeronautical Engineering,
Civil Aviation University of China,
Tianjin 300300, China
e-mail: 2270730653@qq.com

Yunpeng Li

College of Aeronautical Engineering,
Civil Aviation University of China,
Tianjin 300300, China
e-mail: 782598103@qq.com

Xianqu Yue

College of Aeronautical Engineering,
Civil Aviation University of China,
Tianjin 300300, China
e-mail: 544971999@qq.com

Weibin Chen

College of Aeronautical Engineering,
Civil Aviation University of China,
Tianjin 300300, China
e-mail: Weibinchen94@163.com

Chiyu Wang

College of Aeronautical Engineering,
Civil Aviation University of China,
Tianjin 300300, China
e-mail: 745125525@qq.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 10, 2018; final manuscript received May 20, 2019; published online June 12, 2019. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 141(8), 081901 (Jun 12, 2019) (11 pages) Paper No: HT-18-1217; doi: 10.1115/1.4043835 History: Received April 10, 2018; Revised May 20, 2019

## Abstract

In order to ensure flight safety in cold winter, aircraft ground deicing is crucial and necessary. In Chinese deicing fluid heating system, the helically coiled tube is paramount exchanger to heat deicing fluid. The deicing fluid is ethylene-glycol-based mixture with high viscosity. Aiming at heat transfer enhancement of deicing fluid, ring rib is formed by an embossed tube wall toward the internal of the tube; thus, transversely corrugated helically coiled tube (TCHC) is achieved. Depth and width are two key geometrical parameters of ring rib. Based on field synergy principle, the influence of depth–diameter ratio (H/D) and width-diameter ratio (w/D) is investigated through numerical simulation. The results show that outlet temperature, mean convection heat transfer coefficient, and Nusselt number have similar trends, which first increase and then decrease nonlinearly. The variation of flow resistance coefficient is inversely proportional to Reynolds number. Especially, the effect of H/D is more significant than that of w/D. Field synergy angle and velocity field are also analyzed to reveal the mechanism of heat transfer. TCHC performs better than the original tube. Orthogonal experiment calculates the outlet temperature of TCHC when H/D and w/D change. The combination of $H/D=0.075$ and $w/D=0.5$ is best solution. TCHC effectively enhances heat transfer of deicing fluid. Therefore, TCHC is beneficial to improve the deicing efficiency and ensure the flight punctuality.

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## Figures

Fig. 1

The structure of aircraft ground deicing fluid heating system

Fig. 2

Geometric models: (a) smooth helically coiled tube and (b) TCHC

Fig. 3

The structure of ring rib

Fig. 4

Computational mesh: (a) TCHC and (b) smooth helically coiled tube

Fig. 5

Variation of the mean Nu of TCHC at inlet velocity of 0.1 m/s

Fig. 6

Reliability verification of numerical simulation: (a) simulations and experience values of Nu and (b) simulations and experience values of f

Fig. 7

Outlet temperature of heating experiment and simulation

Fig. 8

The outlet temperature distribution of tubes with different H/D at inlet velocity of 5 m/s: (a) the smooth helically coiled tube (H/D = 0), (b) H/D = 0.025, (c) H/D = 0.04, (d) H/D = 0.05, (e) H/D = 0.06, (f) H/D = 0.075, (g)H/D = 0.1, and (h) H/D = 0.2

Fig. 9

Variation of mean H at inlet velocity of 5 m/s

Fig. 10

Variation of mean Nu at inlet velocity of 5 m/s

Fig. 11

Variation of the mean Nu

Fig. 12

Variation of the flow resistance coefficient

Fig. 13

Isosurface of β in smooth helically coiled tube at inlet velocity of 5 m/s: (a) β = 30 deg, (b) β = 40 deg, (c) β = 50 deg, (d) β = 60 deg, (e) β = 70 deg, and (f) β = 80 deg

Fig. 14

Isosurface of β in TCHC with H/D=0.2 at inlet velocity of 5 m/s: (a) β = 30 deg, (b) β = 40 deg, (c) β = 50 deg, (d) β = 60 deg, (e) β = 70 deg, and (f) β = 80 deg

Fig. 15

Section velocity vector at inlet velocity of 5 m/s: (a) H/D=0.06 and (b) H/D=0.2

Fig. 16

The outlet temperature distribution of tubes with different w/D at inlet velocity of 5 m/s: (a) w/D=0.3, (b) w/D=0.4, (c) w/D=0.5, (d) w/D=0.75, (e) w/D=1.0, and (f) w/D=2.0

Fig. 17

Variation of mean Nu at inlet velocity of 5 m/s

Fig. 18

Variation of mean H at inlet velocity of 5 m/s

Fig. 19

Variation of the mean Nu of each tube

Fig. 20

Variation of the flow resistance coefficient

Fig. 21

Isosurface of β = 70 deg at inlet velocity of 5 m/s: (a) w/D = 0.5, (b) w/D = 1.0, and (c) w/D = 2.0

Fig. 22

Section velocity vector at inlet velocity of 5 m/s: (a) w/D = 0.5, (b) w/D = 0.75, and (c) w/D = 2.0

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