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When a horizontal cw laser beam is suddenly turned on in a quiescent isothermal fluid there is a delay time t* during which thermal blooming is governed by absorption of radiation and thermal conduction. For t≳t*, free convection becomes a significant factor. t* is determined by an approximate quasisteady hydrodynamic stability analysis and is compared with existing experimental data.
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Boyd et al. (1975) studied this question.
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