TY - JOUR
T1 - The (Not So Simple!) Chain Fountain
AU - Martins, Rogério
N1 - sem pdf conforme despacho.
PY - 2019
Y1 - 2019
N2 - Given a sufficiently long bead chain in a cup, if we pull the end of the chain over the rim of the cup, the chain tends to continuously “flow” out of the cup, under gravity, in a common siphon process. Surprisingly enough, under certain conditions, the chain forms a fountain in the air! This became known as the Mould effect, after Steve Mould who discovered this phenomenon and made this experiment famous on YouTube [Mould 13] in a video that went viral. The reason for the emergence of this fountain remains unclear. This effect was shown [Biggins and Warner 14] to be due to an anomalous reaction force from the top of the pile of beads; a possible origin for this force was proposed in the same paper. Here, we describe some experiments that contribute toward the clarification of the origin of this force, and show that the explanation goes far beyond the one proposed in [Biggins and Warner 14].
AB - Given a sufficiently long bead chain in a cup, if we pull the end of the chain over the rim of the cup, the chain tends to continuously “flow” out of the cup, under gravity, in a common siphon process. Surprisingly enough, under certain conditions, the chain forms a fountain in the air! This became known as the Mould effect, after Steve Mould who discovered this phenomenon and made this experiment famous on YouTube [Mould 13] in a video that went viral. The reason for the emergence of this fountain remains unclear. This effect was shown [Biggins and Warner 14] to be due to an anomalous reaction force from the top of the pile of beads; a possible origin for this force was proposed in the same paper. Here, we describe some experiments that contribute toward the clarification of the origin of this force, and show that the explanation goes far beyond the one proposed in [Biggins and Warner 14].
KW - bead chain
KW - chain fountain
KW - siphon process
UR - http://www.scopus.com/inward/record.url?scp=85039063223&partnerID=8YFLogxK
U2 - 10.1080/10586458.2017.1413454
DO - 10.1080/10586458.2017.1413454
M3 - Article
AN - SCOPUS:85039063223
SN - 1058-6458
VL - 28
SP - 1
EP - 6
JO - Experimental Mathematics
JF - Experimental Mathematics
IS - 4
ER -