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Author:

Li, Yue (Li, Yue.) | Mu, Jinlei (Mu, Jinlei.) | Xiong, Chengwang (Xiong, Chengwang.) | Sun, Zizheng (Sun, Zizheng.) | Jin, Caiyun (Jin, Caiyun.)

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EI Scopus SCIE

Abstract:

This study investigates the influence of the rheological parameters on the unyielded zone, pressure drop, and secondary flow pattern of non-Newtonian fluid like fresh cement mortar through a pipe bend with different curvatures. The regularized Herschel-Bulkley model is employed in the framework of lattice Boltzmann method to model the effects of the visco-plastic and shear-thickening/thinning characteristics with variations on the yielding stress sigma (0) and the power-law index n. The sharper curvature, higher power-law index contributes to a smaller and more asymmetric unyielded zone and even vanishes for curvature radius R c = 1 D and n=1.4, as the width and distribution of plug region are governed by the comparison between yielding stress and shear stress. The increased yielding stress and power-law index lead to an increase in the total pressure drop and additional pressure loss; however, their variations with respect to the curvature radius display an opposite trend. The intensity of the helical secondary flow in the elbow, primarily governed by the competition between the centrifugal and viscous force, is reduced to about one quarter when sigma (0) and n increase from 0Pa and 0.6 to 50Pa and 1.4.

Keyword:

Author Community:

  • [ 1 ] [Li, Yue]Beijing Univ Technol, Beijing Key Lab Earthquake Engn & Struct Retrofit, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 2 ] [Mu, Jinlei]Beijing Univ Technol, Beijing Key Lab Earthquake Engn & Struct Retrofit, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 3 ] [Xiong, Chengwang]Ocean Univ China, Shandong Prov Key Lab Ocean Engn, Qingdao 266101, Peoples R China
  • [ 4 ] [Xiong, Chengwang]Harbin Engn Univ, Coll Shipbldg Engn, Harbin 150001, Peoples R China
  • [ 5 ] [Sun, Zizheng]Shandong Univ, Sch Qilu Transportat, Jinan 250061, Peoples R China
  • [ 6 ] [Jin, Caiyun]Beijing Univ Technol, Coll Appl Sci, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Xiong, Chengwang]Ocean Univ China, Shandong Prov Key Lab Ocean Engn, Qingdao 266101, Peoples R China;;[Xiong, Chengwang]Harbin Engn Univ, Coll Shipbldg Engn, Harbin 150001, Peoples R China

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Source :

PHYSICS OF FLUIDS

ISSN: 1070-6631

Year: 2021

Issue: 3

Volume: 33

4 . 6 0 0

JCR@2022

ESI Discipline: PHYSICS;

ESI HC Threshold:72

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 15

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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