scholarly journals 414 Drag Reduction of a Rotating Disk with Spiral Grooves : Effect of Spiral Grooves on Transition to Turbulent

2005 ◽  
Vol 2005.43 (0) ◽  
pp. 143-144
Author(s):  
Satoshi OGATA ◽  
Budiarso ◽  
Keizo WATANABE
Keyword(s):  
Drag Reduction ◽  
Rotating Disk ◽  
Spiral Grooves

scholarly journals Drag Reduction of an Enclosed Rotating Disk with Fine Spiral Grooves

2005 ◽  
Vol 71 (712) ◽  
pp. 2849-2855 ◽  
Author(s):  
Keizo WATANABE ◽  
Budiarso ◽  
Satoshi OGATA ◽  
Keigo UEMURA
Keyword(s):  
Drag Reduction ◽  
Rotating Disk ◽  
Spiral Grooves

scholarly journals Drag Reduction of an Enclosed Rotating Disk with Fine Spiral Grooves

2007 ◽  
Vol 2 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Keizo WATANABE ◽  
BUDIARSO ◽  
Satoshi OGATA ◽  
Keigo UEMURA
Keyword(s):  
Drag Reduction ◽  
Rotating Disk ◽  
Spiral Grooves

scholarly journals Enhanced Drag Reduction Performance of Nanocomposites: The Effects of Surface Modification of Nano Silica

2017 ◽  
Vol 26 (4) ◽  
pp. 096369351702600 ◽  
Author(s):  
Xiaodong Dai ◽  
Guicai Zhang ◽  
Bing Li ◽  
Jijiang Ge ◽  
Xuewu Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Drag Reduction ◽  
Rotating Disk ◽  
Shear Resistance ◽  
Test Results ◽  
Nano Silica ◽  
Surface Hydroxyl ◽  
Adsorption Analysis ◽  
Oil Adsorption ◽  
Loop 2

In this paper, nanocomposite was synthesized with nano silica and poly-α-olefin, and the effects of surface modification to the nano silica on its drag reduction performance were investigated. The dosage coupling agent, Y-aminopropyltriethoxysilane, and the modification temperature were studied intensively through surface hydroxyl and oil adsorption analysis. The test results indicated that the hydroxyl number of the silica was decreased by Y-aminopropyltriethoxysilane modification, with improved lipophilicity and oil adsorption. At 50°C, the optimum Y-aminopropyltriethoxysilane dosages were 15% for Nano-Si-10, 5% for Nano-Si-20, and 10% for Degussa-R972. The modification significantly changed the nano silica surface properties and enhanced the interaction with poly-α-olefin. Through drag reduction and shear resistance tests by rotating disk 40 mins degradation and testing loop 2 times shearing, it was shown that the nanocomposite possessed good drag reduction and excellent shear resistance properties.

The drag reduction and degradation characteristics of poly α olefin in diesel via rotating disk apparatus

2018 ◽  
Vol 36 (13) ◽  
pp. 981-986
Author(s):  
Xiaodong Dai ◽  
Lei Li ◽  
Shuming Yin ◽  
Guicai Zhang ◽  
Jijiang Ge
Keyword(s):  
Drag Reduction ◽  
Rotating Disk

Drag Reduction on a Rotating Disk Using a Polymer Additive

1969 ◽  
pp. 251-263 ◽  
Author(s):  
C. Gorman Gilbert ◽  
John F. Ripken
Keyword(s):  
Drag Reduction ◽  
Rotating Disk ◽  
Polymer Additive

scholarly journals Effect of SDBS on the drag reduction characteristics of polyacrylamide in a rotating disk apparatus

2015 ◽  
Vol 4 (3) ◽  
pp. 326 ◽  
Author(s):  
Hayder A. Abdul Bari ◽  
Zainab Yousif ◽  
Zulkefli Bin Yaacob ◽  
Edward Oluwasogaakindoyo
Keyword(s):  
Drag Reduction ◽  
Rotating Disk ◽  
Reynolds Numbers ◽  
Aggregate Structure ◽  
Surfactant Micelle ◽  
Micro Particles ◽  
Transmission Electron ◽  
Speed Up ◽  
Reduction Characteristics

<p>This paper focuses on the determination of the interaction between polymer (Polyacrylamide (PAM)) and surfactant (Sodium dod benzene sulfonate (SDBS)) as a drag reducer using Rotating Disk apparatus (RDA) at various concentrations (500, 700, 1000, 1500 and 2000) ppm individually and in the combined form under turbulent conditions at different rotation speed up to 3000 rpm, as well as studying their mechanisms as a drag reducer. The results show that the maximum percent drag reduction increases to (40, 41, 43, 45 and 48)% by using the combined additives of surfactant and polymer at the above concentrations respectively, with slower degradation and display drag reduction for a larger range of Reynolds numbers. The nano and micro particles formed from the combined PAA and SDBSA was studied using cryo-transmission electron microscopy (cryo-TEM) techniques. The images show the surrounding of polymer chain to the surfactant micelle to form an aggregate structure. A hexagonal crystalline form was suggested to describe the shape of the aggregate structure.</p>

Drag reduction of a rotating disk with many fine grooves

2004 ◽  
Vol 2004.10 (0) ◽  
pp. 311-312
Author(s):  
Keizo WATANABE ◽  
Budiarso ◽  
Satoshi OGATA ◽  
Keigo UEMURA
Keyword(s):  
Drag Reduction ◽  
Rotating Disk

scholarly journals Enhancing the Drag Reduction Phenomenon within a Rotating Disk Apparatus Using Polymer-Surfactant Additives

2016 ◽  
Vol 6 (12) ◽  
pp. 355 ◽  
Author(s):  
Musaab Rashed ◽  
Mohamad Mohd Salleh ◽  
Hayder Abdulbari ◽  
Mohd Ismail
Keyword(s):  
Drag Reduction ◽  
Rotating Disk ◽  
Polymer Surfactant

A high-precision rotating disk apparatus for drag reduction characterization

2000 ◽  
Vol 20 (1) ◽  
pp. 43-48 ◽  
Author(s):  
C.A Kim ◽  
D.S Jo ◽  
H.J Choi ◽  
C.B Kim ◽  
M.S Jhon
Keyword(s):  
Drag Reduction ◽  
High Precision ◽  
Rotating Disk
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