{"id":5250,"date":"2024-11-30T18:11:56","date_gmt":"2024-11-30T09:11:56","guid":{"rendered":"https:\/\/tuat-chemphys.net\/?p=5250"},"modified":"2024-11-30T18:13:06","modified_gmt":"2024-11-30T09:13:06","slug":"unraveling-the-mysteries-of-viscous-fingering-in-reacting-flows-%e5%8f%8d%e5%bf%9c%e6%b5%81%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e7%b2%98%e6%80%a7%e3%83%95%e3%82%a3%e3%83%b3%e3%82%ac%e3%83%aa%e3%83%b3","status":"publish","type":"post","link":"https:\/\/tuat-chemphys.net\/?p=5250","title":{"rendered":"Unraveling the Mysteries of Viscous Fingering in Reacting Flows. \u53cd\u5fdc\u6d41\u306b\u304a\u3051\u308b\u7c98\u6027\u30d5\u30a3\u30f3\u30ac\u30ea\u30f3\u30b0\u306e\u8b0e\u3092\u89e3\u660e"},"content":{"rendered":"\n

English follows Japanese. https:\/\/doi.org\/10.1103\/PhysRevFluids.7.023201<\/a><\/p>\n\n\n\n

\u53cd\u5fdc\u6d41\u306b\u304a\u3051\u308b\u7c98\u6027\u30d5\u30a3\u30f3\u30ac\u30ea\u30f3\u30b0\u306e\u8b0e\u3092\u89e3\u660e<\/h4>\n\n\n\n

\u9577\u6d25\u7814\u7a76\u5ba4\uff08\u5927\u5b66\u9662\u751f\u304c\u7b2c\u4e00\u8457\u8005\uff09\u306f\u3001\u6d41\u4f53\u5185\u3067\u5316\u5b66\u53cd\u5fdc\u304c\u8d77\u3053\u308b\u53cd\u5fdc\u6d41\u306b\u304a\u3044\u3066\u3001\u6d41\u308c\u306e\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u304c\u5909\u5316\u3059\u308b\u8208\u5473\u6df1\u3044\u73fe\u8c61\u3092\u767a\u898b\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u7814\u7a76\u306f\u30012\u3064\u306e\u6d41\u4f53\u306e\u754c\u9762\u304c\u4e0d\u5b89\u5b9a\u306b\u306a\u308a\u3001\u6307\u72b6\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u5f62\u6210\u3059\u308b\u7c98\u6027\u30d5\u30a3\u30f3\u30ac\u30ea\u30f3\u30b0\uff08VF\uff09\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u3044\u307e\u3059\u3002\u5316\u5b66\u53cd\u5fdc\u306b\u3088\u3063\u3066\u30b2\u30eb\u304c\u751f\u6210\u3055\u308c\u308b\u3068\u3001\u3053\u306e\u30b2\u30eb\u306e\u5f37\u5ea6\u304cVF\u30d1\u30bf\u30fc\u30f3\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u5b9f\u9a13\u3067\u306f\u3001\u5f31\u3044\u30b2\u30eb\u306f\u975e\u53cd\u5fdc\u306e\u5834\u5408\u3068\u540c\u69d8\u306eVF\u30d1\u30bf\u30fc\u30f3\u3092\u793a\u3057\u3001\u4e2d\u7a0b\u5ea6\u306e\u5f37\u5ea6\u306e\u30b2\u30eb\u306f\u30d5\u30a3\u30f3\u30ac\u30fc\u3092\u72ed\u304f\u3057\u3001\u5f37\u3044\u30b2\u30eb\u306f\u30d5\u30a3\u30f3\u30ac\u30fc\u3092\u5e83\u304f\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u306e\u5909\u5316\u306f\u3001\u30b2\u30eb\u306e\u7c98\u5f3e\u6027\u7279\u6027\u306b\u3088\u308b\u3082\u306e\u3067\u3001\u305d\u306e\u5f37\u5ea6\u306b\u5fdc\u3058\u3066\u6d41\u308c\u306b\u7570\u306a\u308b\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002\u7814\u7a76\u306f\u3001\u3053\u308c\u3089\u306e\u52b9\u679c\u3092\u8aac\u660e\u3059\u308b\u30e2\u30c7\u30eb\u3092\u63d0\u6848\u3057\u3001\u6d41\u308c\u306e\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u3092\u5236\u5fa1\u3059\u308b\u4e0a\u3067\u30b2\u30eb\u306e\u5f37\u5ea6\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306e\u91cd\u8981\u6027\u3092\u5f37\u8abf\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

Unraveling the Mysteries of Viscous Fingering in Reacting Flows<\/h3>\n\n\n\n

Researchers (Nagatsu Lab) have discovered a fascinating phenomenon in reacting flows where chemical reactions within a fluid can change the flow dynamics. This study focuses on viscous fingering (VF), a process where the interface between two fluids becomes unstable, forming finger-like patterns. When a chemical reaction produces a gel, the strength of this gel can significantly alter the VF patterns.<\/p>\n\n\n\n

The experiments showed that weak gels result in VF patterns similar to non-reactive cases, medium-strength gels make the fingers narrower, and strong gels make them wider. These changes are due to the gel’s viscoelastic properties, which affect the flow differently based on its strength. The study proposes a model to explain these effects, highlighting the importance of understanding gel strength in controlling flow dynamics.<\/p>\n\n\n\n

\"\"
Figure: (a) ~ (c) Viscous fingering pattern for the gel elasticity is (a) low (b) medium (c) high. (d) Results obtained from stability analysis of flow interface considering viscoelastic properties. In the x-axis, \u03b2\u22121 < 0 or \u03b2\u22121 > 0 means that the gel has shear thinning viscosity or shear thickening viscosity. In the y-axis, \u03b72 > 0 is the shear viscosity of the gel at a certain shear rate. \u56f3: (a) \uff5e (c) \u30b2\u30eb\u306e\u5f3e\u6027\u304c (a) \u4f4e\u3044 (b) \u4e2d\u7a0b\u5ea6 (c) \u9ad8\u3044\u5834\u5408\u306e\u7c98\u6027\u30d5\u30a3\u30f3\u30ac\u30ea\u30f3\u30b0\u30d1\u30bf\u30fc\u30f3\u3002 (d) \u7c98\u5f3e\u6027\u7279\u6027\u3092\u8003\u616e\u3057\u305f\u6d41\u308c\u306e\u754c\u9762\u306e\u5b89\u5b9a\u6027\u89e3\u6790\u304b\u3089\u5f97\u3089\u308c\u305f\u7d50\u679c\u3002x\u8ef8\u3067\u306f\u3001\u03b2\u22121 < 0 \u307e\u305f\u306f \u03b2\u22121 > 0 \u306f\u30b2\u30eb\u304c\u305b\u3093\u65ad\u6e1b\u7c98\u6027\u307e\u305f\u306f\u305b\u3093\u65ad\u5897\u7c98\u6027\u3092\u6301\u3064\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u3002y\u8ef8\u3067\u306f\u3001\u03b72 > 0 \u306f\u7279\u5b9a\u306e\u305b\u3093\u65ad\u901f\u5ea6\u3067\u306e\u30b2\u30eb\u306e\u305b\u3093\u65ad\u7c98\u5ea6\u3092\u793a\u3059\u3002<\/figcaption><\/figure>\n\n\n\n

https:\/\/doi.org\/10.1103\/PhysRevFluids.7.023201<\/a><\/p>\n\n\n\n

Reversal of effects from gel production in a reacting flow dependent on gel strength<\/h1>\n\n\n\n

Sae Hirano,\u00a0Yuichiro Nagatsu, and\u00a0Ryuta X. Suzuki<\/p>\n\n\n\n

Phys. Rev. Fluids\u00a07<\/strong>, 023201, 2022<\/strong> https:\/\/doi.org\/10.1103\/PhysRevFluids.7.023201<\/a><\/p>\n\n\n

\n
\"\"<\/a><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"

Chemical reactions in flowing fluids can change the flow dynamics. This discovery helps us understand how different gel strengths can control fluid flow.
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