Objective
An experimental set up has been devised to mimic Strombolian volcanic eruptions, where a series of large bubbles breaking at the surface of the lava columns produces the characteristic explosions. Acoustic measurements have shown that most of the noise is produced by the vibration of the bubble prior to bursting, and that the bursting is much less energetic by comparison.
The equipment consists of a long vertical cylindrical tube (2 m high and 0.14 m in diameter) filled with oils of different viscosities. Large overpressurized bubbles of controlled size are introduced at the bottom of the tube. A microphone and sonometer record the noise of the bubble as it rises, and its position in recorded simultaneously by high speed photography.
It was found that the bubble undergoes oscillations of shape and volume. The uppermost surface of the liquid was also found to develop an instability when the bubble was at a distance of once or twice the tube diameter from the surface. The frequency of the instability was not dependent on the viscosity of the liquid, and ranged from 5 to 9 Hertz.
Fields of science (EuroSciVoc)
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.