Frontiers | Classification and Evaluation of Volcanic
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6 FAQs about [The principle of lava energy storage]
How does heat advect out of a lava deposit?
Heat then advects out of the ALFS by the transfer of mass to the “lava deposit” system and, thus, by heat loss to the surroundings through radiation and/or convection. Heat and potential energy for given Δ T and Δ h. For the calculation of Q, a constant c p is assumed, although c p can vary with temperature (e.g., Dingwell 1998 ).
When does a lava flow need a power supply?
It only applies when a lava flow, evolving under a constant supply, attains steady-state conditions (i.e., when both the mass and the heat budgets balance). In this case, the power supply is the volcano which is supposed to supply lava at a constant rate. The similarity between the three expressions of Eqs.
How does a lava flow behave?
The emerging picture is that a lava flow behaves both (i) as a gravity-driven flow advancing towards the steepest slope and (ii) as a “lava current,” which, through analogy with an electric current, is controlled by the least dissipation principle.
How does a lava circuit work?
An electric current propagates almost instantaneously through an existing circuit, following the Kirchhoff law (a least dissipation principle). Flowing lavas, in contrast, build up a slow-motion “lava circuit” over days, weeks, or months by following a gravity-driven path down the steepest slopes.
Does emplacement of a lava flow occur in thermodynamic equilibrium?
Thus, emplacement of a lava flow occurs far from thermodynamic equilibrium, as recently acknowledged in works dealing with the syn-emplacement evolution of lava texture and rheology (Chevrel et al. 2013; Kolzenburg et al. 2016, 2017 ).
What is an example of a regular duration of lava flow units?
An additional example of a regular duration of lava flow units can be found in the typical emplacement of pillow lavas, characterized by the buddying of new units at a relatively constant pace (Jones 1968; Walker 1992 ), without clear evidence of a cooling limited stop (Moore 1975 ).