<p>For negative values of the spreading coefficient (that is, in the so-called “partial wetting” regime), we prove that the thin-film equation with zero slip and repulsive potentials <i>P</i> of the form <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(P(h)\approx h^{1-m}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>P</mi> <mrow> <mo stretchy="false">(</mo> <mi>h</mi> <mo stretchy="false">)</mo> </mrow> <mo>≈</mo> <msup> <mi>h</mi> <mrow> <mn>1</mn> <mo>-</mo> <mi>m</mi> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation> as <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(h\rightarrow 0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>h</mi> <mo stretchy="false">→</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(m&gt;1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>m</mi> <mo>&gt;</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation>, admits for any positive speed a one-parameter family of travelling-wave solutions with a contact line and (as in standard slippage models) a logarithmically-corrected linear behaviour as <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(h\rightarrow +\infty \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>h</mi> <mo stretchy="false">→</mo> <mo>+</mo> <mi>∞</mi> </mrow> </math></EquationSource> </InlineEquation>. Locally around the contact-line, these waves have finite rate of dissipation for any <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(m&gt;1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>m</mi> <mo>&gt;</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> and finite energy for any <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(m\in (1,3)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>m</mi> <mo>∈</mo> <mo stretchy="false">(</mo> <mn>1</mn> <mo>,</mo> <mn>3</mn> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>. The result thus confirms that mildly repulsive potentials effectively resolve the no-slip paradox. The family is parametrized by a thermodynamically consistent contact-line condition which reduces to the classical fixed microscopic contact-angle one if <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(P\equiv 0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>P</mi> <mo>≡</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>.</p>

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Advancing Fronts for the Thin-Film Equation with Null Slip and Repulsive Potentials: The Case of Partial Wetting

  • Riccardo Durastanti,
  • Lorenzo Giacomelli

摘要

For negative values of the spreading coefficient (that is, in the so-called “partial wetting” regime), we prove that the thin-film equation with zero slip and repulsive potentials P of the form \(P(h)\approx h^{1-m}\) P ( h ) h 1 - m as \(h\rightarrow 0\) h 0 , \(m>1\) m > 1 , admits for any positive speed a one-parameter family of travelling-wave solutions with a contact line and (as in standard slippage models) a logarithmically-corrected linear behaviour as \(h\rightarrow +\infty \) h + . Locally around the contact-line, these waves have finite rate of dissipation for any \(m>1\) m > 1 and finite energy for any \(m\in (1,3)\) m ( 1 , 3 ) . The result thus confirms that mildly repulsive potentials effectively resolve the no-slip paradox. The family is parametrized by a thermodynamically consistent contact-line condition which reduces to the classical fixed microscopic contact-angle one if \(P\equiv 0\) P 0 .