The (Not So Simple!) Chain Fountain

Research output: Contribution to journalArticle

Abstract

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].

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalExperimental Mathematics
DOIs
Publication statusAccepted/In press - 23 Dec 2017

Fingerprint

Anomalous
Experiment
Gravity
Tend
Form

Keywords

  • bead chain
  • chain fountain
  • siphon process

Cite this

@article{509f2f74ee5b42e399bba7867b56dc2b,
title = "The (Not So Simple!) Chain Fountain",
abstract = "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].",
keywords = "bead chain, chain fountain, siphon process",
author = "Rog{\'e}rio Martins",
note = "sem pdf conforme despacho.",
year = "2017",
month = "12",
day = "23",
doi = "10.1080/10586458.2017.1413454",
language = "English",
pages = "1--6",
journal = "Experimental Mathematics",
issn = "1058-6458",
publisher = "Taylor & Francis",

}

The (Not So Simple!) Chain Fountain. / Martins, Rogério.

In: Experimental Mathematics, 23.12.2017, p. 1-6.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The (Not So Simple!) Chain Fountain

AU - Martins, Rogério

N1 - sem pdf conforme despacho.

PY - 2017/12/23

Y1 - 2017/12/23

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

SP - 1

EP - 6

JO - Experimental Mathematics

JF - Experimental Mathematics

SN - 1058-6458

ER -