Abstract: In this experimental work, a conus impacts a deep liquid pool at a speed varying from 1.3 to 19.0 mcm ms−1 . Two liquids (2.5 % butanol–water solution or distilled water) and four coni made from duralumin with a diameter of 180 mm and different deadrise angles eta ( 2∘ , 3∘ , 4∘ and 5 ∘ ) are tested. An air cushion is trapped between the conus solid surface and the liquid. Several types of bubble patterns after the collapse of the air cushion are observed: one or multiple bubbles near the conus centre (vertex), irregular trails of bubbles on the conus surface and a ring of bubbles in a ‘necklace'-shaped arrangement. With a total internal reflection set-up and appropriate image post-processing, the external and internal radii of the ring-shaped wetted area are estimated for each frame. The external (internal) radius increases (decreases) in time following a linear (exponential) law. The speed of the outer border of the wetted area is in agreement with the Wagner theory for a body impacting onto a liquid. The initial radius of the annular touchdown region is estimated as the intersection of the relevant fitting curves. In the studied range of parameters, the initial radius obeys a universal scaling law, which follows from the air–water lubrication–inertia balance.

Cite: Carrat J. , Gavrilov N.V. , Cherdantsev A.V. , Shmakova N.D. , Ermanyuk E.V.
Air entrapment at impact of a conus onto a liquid
Journal of Fluid Mechanics. 2023. N966. R1 :1-13. DOI: 10.1017/jfm.2023.394 WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Feb 3, 2023
Accepted:	May 1, 2023
Published print:	Jul 3, 2023

Identifiers:

Web of science:	WOS:001022296800001
Scopus:	2-s2.0-85164297943
Elibrary:	61046705
OpenAlex:	W4382985835

Citing:

DB	Citing
OpenAlex	1
Elibrary	3
Scopus	1
Web of science	2

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