Experimental Investigation of Turbulent Cross-flow in a Staggered Tube Bundle with Wavy Cylinders

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F22%3APU145403" target="_blank" >RIV/00216305:26110/22:PU145403 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.jstage.jst.go.jp/article/ijfms/15/3/15_344/_article/-char/ja" target="_blank" >https://www.jstage.jst.go.jp/article/ijfms/15/3/15_344/_article/-char/ja</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5293/IJFMS.2022.15.3.344" target="_blank" >10.5293/IJFMS.2022.15.3.344</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental Investigation of Turbulent Cross-flow in a Staggered Tube Bundle with Wavy Cylinders

Popis výsledku v původním jazyce

This paper presents the results of an investigation on the effects of wavy cylindrical tubes on the turbulent cross-flow in a staggered tube bundle arrangement with transverse and longitudinal pitch-to-diameter ratios of 3.8 and 2.1, respectively. Two models of staggered tube bundles equipped with wavy cylinders are tested; the Model-A having a wavelength ratio (λ/Dm= 2) corresponding to a wave steepness (a/λ = 0.1) and the Model-B having (λ/Dm= 1) corresponding to (a/λ = 0.2).Experimental measurements were performed using a subsonic wind tunnel to study and compare the flow characteristics of the new configuration of cylindrical tubes with that of a similar arrangement with smooth cylinders for Reynolds numbers ranging from 0.5×104 to 2×104 based on the mean tube diameter and the free stream velocity. Experimental results show that the circumferential minimum pressure coefficients for wavy tube bundles are greater than at the bundle with smooth cylinders. As a result, the lift forces of wavy tube bundles are suppressed and a significant drag reduction is observed up to 20% for both wavy models. This continuous reduction of the drag force becomes larger with the increase of Reynolds number. © 2022, Turbomachinery Society of Japan. All rights reserved.

Název v anglickém jazyce

Experimental Investigation of Turbulent Cross-flow in a Staggered Tube Bundle with Wavy Cylinders

Popis výsledku anglicky

This paper presents the results of an investigation on the effects of wavy cylindrical tubes on the turbulent cross-flow in a staggered tube bundle arrangement with transverse and longitudinal pitch-to-diameter ratios of 3.8 and 2.1, respectively. Two models of staggered tube bundles equipped with wavy cylinders are tested; the Model-A having a wavelength ratio (λ/Dm= 2) corresponding to a wave steepness (a/λ = 0.1) and the Model-B having (λ/Dm= 1) corresponding to (a/λ = 0.2).Experimental measurements were performed using a subsonic wind tunnel to study and compare the flow characteristics of the new configuration of cylindrical tubes with that of a similar arrangement with smooth cylinders for Reynolds numbers ranging from 0.5×104 to 2×104 based on the mean tube diameter and the free stream velocity. Experimental results show that the circumferential minimum pressure coefficients for wavy tube bundles are greater than at the bundle with smooth cylinders. As a result, the lift forces of wavy tube bundles are suppressed and a significant drag reduction is observed up to 20% for both wavy models. This continuous reduction of the drag force becomes larger with the increase of Reynolds number. © 2022, Turbomachinery Society of Japan. All rights reserved.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Fluid Machinery and Systems

ISSN

1882-9554

e-ISSN

—

Svazek periodika

15

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

KR - Korejská republika

Počet stran výsledku

12

Strana od-do

344-355

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85136251968