Heat Transfer Enhancement in Round Tube Using Wire Coil. Influence of Clearance between Inner Wall and Wire Coil.

Shoji, Yukitsugu; Sato, Kyozo; Oliver, Dana

doi:10.1252/kakoronbunshu.24.568

Cited by 3 publications

(1 citation statement)

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“…In regard to wire coil inserts, there are recent reports by Inaba and colleagues [1,2] and Shoji and colleagues [3,4] dealing with the heat transfer coefficient and the flow resistance in the transition region from laminar flow to turbulent flow for single-phase flows. An experimental investigation of the occurrence of critical heat flux in subcooled flow boiling of water has been carried out by Celata and colleagues [5] who found that use of turbulence promoters in a tube with a wire coil is an effective method for subcooled flow boiling critical heat flux.…”

Section: Introductionmentioning

confidence: 99%

The flow characteristics of an upward gas‐liquid two‐phase flow in a vertical tube with a wire coil: Part 2. Effect on void fraction and liquid film thickness

Takeshima

Fujii

Takenaka

et al. 2002

Heat Trans. Asian Res.

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An experimental study has been carried out to clarify the characteristics of the void fraction and the liquid film thickness of the air‐water two‐phase flow in vertical tubes of 25‐mm inside diameter with wire coils of varying wire diameter and pitch. The flow pattern in the experiment on the average void fraction and the local void fraction distribution in cross section was a bubble flow, and the liquid film thickness was in the region of semiannular and annular flows. It is clarified from these experiments that the average void fraction in tubes with wire coils is lower than that in a smooth tube and decreases with the wire diameter owing to the centrifugal force of the swirl flow which concentrates bubbles at the center of the tube, that the local liquid film thickness becomes more uniform with a decrease in the pitch of the wire coil, and that the liquid film becomes thicker after the passage through the wire coil with an increase in the wire diameter. © 2002 Wiley Periodicals, Inc. Heat Trans Asian Res, 31(8): 652–664, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/htj.10067

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Section: Introductionmentioning

confidence: 99%

The flow characteristics of an upward gas‐liquid two‐phase flow in a vertical tube with a wire coil: Part 2. Effect on void fraction and liquid film thickness

Takeshima

Fujii

Takenaka

et al. 2002

Heat Trans. Asian Res.

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Heat transfer enhancement in round tube using wire coil: Influence of length and segmentation

Shoji

Sato

Oliver

2003

Heat Trans. Asian Res.

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Experiments are performed to study heat transfer enhancement in a round tube using a wire coil as a turbulator. This paper presents the effects of length and segmentation of the wire coil. Experiments are conducted with three different wire coils (1000, 500, and 300 mm) on the effect of length. The wire coils used to measure the effect of segmentation are three different types but of the same area (500 mm × 1, 100 mm × 5, and 50 mm × 10). The wire coils are made of copper of diameter 1.5 mm. The test fluid is water. Both heat transfer and friction factor are measured and compared. From the experiments, we were able to conclude that heat transfer and friction positively correlate to length of the wire coil. Heat transfer correlations are given as Eq. (7) for length and Eq. (10) for segmentation. © 2003 Wiley Periodicals, Inc. Heat Trans Asian Res, 32(2): 99–107, 2003; Published online in Wiley InterScience (http://www.interscience.wiley.com). DOI 10.1002/htj.10072

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Flow-induced vibration in two-phase flow with wire coil inserts

Kim

Chang

2008

International Journal of Multiphase Flow

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Heat Transfer Enhancement in Round Tube Using Wire Coil. Influence of Clearance between Inner Wall and Wire Coil.

Cited by 3 publications

References 0 publications

The flow characteristics of an upward gas‐liquid two‐phase flow in a vertical tube with a wire coil: Part 2. Effect on void fraction and liquid film thickness

The flow characteristics of an upward gas‐liquid two‐phase flow in a vertical tube with a wire coil: Part 2. Effect on void fraction and liquid film thickness

Heat transfer enhancement in round tube using wire coil: Influence of length and segmentation

Flow-induced vibration in two-phase flow with wire coil inserts

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