Spreading of completely wetting or partially wetting power-law fluid on solid surface

X. D. Wang; Y. Zhang; D. J. Lee; X. F. Peng

doi:10.1021/la700232y

Spreading of completely wetting or partially wetting power-law fluid on solid surface

X. D. Wang
, Y. Zhang
, D. J. Lee
, X. F. Peng

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

83 Citations (Scopus)

Abstract

This study investigated the drop-spreading dynamics of pseudo-plastic and dilatant fluids. Experimental results indicated that the spreading law for both fluids is related to Rheological characteristics or power exponent n. For the completely wetting system, the evolution of the wetting radius over time can be expressed by the power law R = at^m, where the spreading exponent m of the dilatant fluids is >0.1 and the spreading exponent m of pseudo-plastic fluids is <0.1. The strength of non-Newtonian effects is positively correlated to the extent of deviation from the theoretical value 0.1 of m for Newtonian fluids. For the partially wetting system, the power law on the time dependence of the wetting radius no longer holds; therefore, an exponential power law, R = R_eq(1-exp(-at^m/R_eq)), is proposed, where R_eq denotes the equilibrium radius of drop and a is a coefficient. Comparing experimental data with the exponential power law revealed that both are in good agreement. © 2007 American Chemical Society.

Original language	English
Pages (from-to)	9258-9262
Journal	Langmuir
Volume	23
Issue number	18
DOIs	https://doi.org/10.1021/la700232y
Publication status	Published - 28 Aug 2007
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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title = "Spreading of completely wetting or partially wetting power-law fluid on solid surface",

abstract = "This study investigated the drop-spreading dynamics of pseudo-plastic and dilatant fluids. Experimental results indicated that the spreading law for both fluids is related to Rheological characteristics or power exponent n. For the completely wetting system, the evolution of the wetting radius over time can be expressed by the power law R = atm, where the spreading exponent m of the dilatant fluids is >0.1 and the spreading exponent m of pseudo-plastic fluids is <0.1. The strength of non-Newtonian effects is positively correlated to the extent of deviation from the theoretical value 0.1 of m for Newtonian fluids. For the partially wetting system, the power law on the time dependence of the wetting radius no longer holds; therefore, an exponential power law, R = Req(1-exp(-atm/Req)), is proposed, where Req denotes the equilibrium radius of drop and a is a coefficient. Comparing experimental data with the exponential power law revealed that both are in good agreement. {\textcopyright} 2007 American Chemical Society.",

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AU - Wang, X. D.

AU - Zhang, Y.

AU - Lee, D. J.

AU - Peng, X. F.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2007/8/28

Y1 - 2007/8/28

N2 - This study investigated the drop-spreading dynamics of pseudo-plastic and dilatant fluids. Experimental results indicated that the spreading law for both fluids is related to Rheological characteristics or power exponent n. For the completely wetting system, the evolution of the wetting radius over time can be expressed by the power law R = atm, where the spreading exponent m of the dilatant fluids is >0.1 and the spreading exponent m of pseudo-plastic fluids is <0.1. The strength of non-Newtonian effects is positively correlated to the extent of deviation from the theoretical value 0.1 of m for Newtonian fluids. For the partially wetting system, the power law on the time dependence of the wetting radius no longer holds; therefore, an exponential power law, R = Req(1-exp(-atm/Req)), is proposed, where Req denotes the equilibrium radius of drop and a is a coefficient. Comparing experimental data with the exponential power law revealed that both are in good agreement. © 2007 American Chemical Society.

AB - This study investigated the drop-spreading dynamics of pseudo-plastic and dilatant fluids. Experimental results indicated that the spreading law for both fluids is related to Rheological characteristics or power exponent n. For the completely wetting system, the evolution of the wetting radius over time can be expressed by the power law R = atm, where the spreading exponent m of the dilatant fluids is >0.1 and the spreading exponent m of pseudo-plastic fluids is <0.1. The strength of non-Newtonian effects is positively correlated to the extent of deviation from the theoretical value 0.1 of m for Newtonian fluids. For the partially wetting system, the power law on the time dependence of the wetting radius no longer holds; therefore, an exponential power law, R = Req(1-exp(-atm/Req)), is proposed, where Req denotes the equilibrium radius of drop and a is a coefficient. Comparing experimental data with the exponential power law revealed that both are in good agreement. © 2007 American Chemical Society.

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U2 - 10.1021/la700232y

DO - 10.1021/la700232y

M3 - RGC 21 - Publication in refereed journal

SN - 0743-7463

VL - 23

SP - 9258

EP - 9262

JO - Langmuir

JF - Langmuir

IS - 18

ER -

Spreading of completely wetting or partially wetting power-law fluid on solid surface

Abstract

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