Role of Air in Granular Jet Formation

by: Gabriel Caballero, Raymond Bergmann, Devaraj van der Meer, Andrea Prosperetti, Detlef Lohse

Physical Review Letters, Vol. 99, No. 1. (2007)

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2007, flow, grains

Abstract

A steel ball impacting on a bed of very loose, fine sand results in a surprisingly vigorous jet which shoots up from the surface of the sand [D. Lohse et al., Phys. Rev. Lett. 93, 198003 (2004)]. When the ambient pressure p is reduced, the jet is found to be less vigorous [R. Royer et al., Nature Phys. 1, 164 (2005)]. In this Letter we show that p also affects the rate of penetration of the ball: Higher pressure increases the rate of penetration, which makes the cavity created by the ball close deeper into the sand bed, where the hydrostatic pressure is stronger, thereby producing a more energetic collapse and jetting. The origin of the deeper penetration under normal ambient pressure is found to lie in the extra sand fluidization caused by the air flow induced by the falling ball.

@article{citeulike:2553084, abstract = {A steel ball impacting on a bed of very loose, fine sand results in a surprisingly vigorous jet which shoots up from the surface of the sand [D. Lohse et al., Phys. Rev. Lett. 93, 198003 (2004)]. When the ambient pressure p is reduced, the jet is found to be less vigorous [R. Royer et al., Nature Phys. 1, 164 (2005)]. In this Letter we show that p also affects the rate of penetration of the ball: Higher pressure increases the rate of penetration, which makes the cavity created by the ball close deeper into the sand bed, where the hydrostatic pressure is stronger, thereby producing a more energetic collapse and jetting. The origin of the deeper penetration under normal ambient pressure is found to lie in the extra sand fluidization caused by the air flow induced by the falling ball.}, author = {Caballero, Gabriel and Bergmann, Raymond and van der Meer, Devaraj and Prosperetti, Andrea and Lohse, Detlef }, citeulike-article-id = {2553084}, doi = {10.1103/PhysRevLett.99.018001}, journal = {Physical Review Letters}, keywords = {2007, flow, grains}, number = {1}, posted-at = {2008-03-18 22:10:39}, priority = {2}, publisher = {APS}, title = {Role of Air in Granular Jet Formation}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000099000001018001000001\&idtype=cvips\&gifs=yes}, volume = {99}, year = {2007} }

RIS record

TY - JOUR ID - citeulike:2553084 L3 - citeulike-article-id:2553084 TI - Role of Air in Granular Jet Formation JF - Physical Review Letters VL - 99 IS - 1 PB - APS N2 - A steel ball impacting on a bed of very loose, fine sand results in a surprisingly vigorous jet which shoots up from the surface of the sand [D. Lohse et al., Phys. Rev. Lett. 93, 198003 (2004)]. When the ambient pressure p is reduced, the jet is found to be less vigorous [R. Royer et al., Nature Phys. 1, 164 (2005)]. In this Letter we show that p also affects the rate of penetration of the ball: Higher pressure increases the rate of penetration, which makes the cavity created by the ball close deeper into the sand bed, where the hydrostatic pressure is stronger, thereby producing a more energetic collapse and jetting. The origin of the deeper penetration under normal ambient pressure is found to lie in the extra sand fluidization caused by the air flow induced by the falling ball. KW - 2007 KW - flow KW - grains AU - Caballero, Gabriel AU - Bergmann, Raymond AU - van der Meer, Devaraj AU - Prosperetti, Andrea AU - Lohse, Detlef PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000099000001018001000001&idtype=cvips&gifs=yes ER -

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