Effect of a magnetic field on sonoluminescence.

Abstract

The effect of a magnetic field on single-bubble sonoluminescence in water reported experimentally by Young, Schmiedel, and Kang [Phys. Rev. Lett. 77, 4816 (1996)] is studied theoretically. It is suggested that bubble dynamics is affected by the magnetic field because moving water molecules of the liquid suffer torque due to the Lorentz force acting on their electrical dipole moment, which results in the transformation of some of the kinetic energy into heat. It is shown that the magnetic field acts as if the ambient pressure of the liquid were increased. It is suggested that the effect increases as the amount of the liquid water increases. It is predicted that nonpolar liquid such as dodecane exhibits no effect of the magnetic field.

AI evidence extraction

Main findings

A theoretical analysis suggests a magnetic field can affect single-bubble sonoluminescence in water by altering bubble dynamics via Lorentz-force torque on moving water molecules’ electrical dipole moments, transforming some kinetic energy into heat. The magnetic field is described as acting as if the ambient pressure were increased, with a suggested stronger effect as the amount of liquid water increases. The paper predicts no magnetic-field effect in a nonpolar liquid such as dodecane.

Outcomes measured

• single-bubble sonoluminescence (theoretical effect on bubble dynamics)
• heat generation/kinetic energy transformed into heat
• effective increase in ambient pressure

Limitations

• The work is theoretical (mechanism/modeling) rather than a new experimental exposure study.
• Magnetic-field characteristics (strength, static vs time-varying) are not specified in the abstract.
• No quantitative effect sizes or uncertainty estimates are provided in the abstract.

{
    "study_type": "other",
    "exposure": {
        "band": null,
        "source": "magnetic field",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "single-bubble sonoluminescence (theoretical effect on bubble dynamics)",
        "heat generation/kinetic energy transformed into heat",
        "effective increase in ambient pressure"
    ],
    "main_findings": "A theoretical analysis suggests a magnetic field can affect single-bubble sonoluminescence in water by altering bubble dynamics via Lorentz-force torque on moving water molecules’ electrical dipole moments, transforming some kinetic energy into heat. The magnetic field is described as acting as if the ambient pressure were increased, with a suggested stronger effect as the amount of liquid water increases. The paper predicts no magnetic-field effect in a nonpolar liquid such as dodecane.",
    "effect_direction": "mixed",
    "limitations": [
        "The work is theoretical (mechanism/modeling) rather than a new experimental exposure study.",
        "Magnetic-field characteristics (strength, static vs time-varying) are not specified in the abstract.",
        "No quantitative effect sizes or uncertainty estimates are provided in the abstract."
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "magnetic field",
        "sonoluminescence",
        "single-bubble",
        "bubble dynamics",
        "Lorentz force",
        "dipole moment",
        "water",
        "dodecane"
    ],
    "suggested_hubs": []
}

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