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http://worldcat.org/entity/work/id/8127333

Transient cooling of a hot surface by droplet evaporation

The thermal behavior of a hot aluminum surface subjected to cold water droplet impingement is investigated. Evaporation phenomena of a single droplet of pure water is studied for initial surface temperature ranging from 75 to 100 C (implying full suppression of nucleate boiling). The effect of droplet release height, initial surface temperature and, droplet volume on the geometrical configuration of the droplet is investigated. A computer model is developed to predict the cooling effect (volume of influence) induced by a single droplet in contact with the hot surface, using finite difference techniques. A model to predict the evaporation of water droplets deposited on a hot non-porous solid surface is derived.

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  • "The thermal behavior of a hot aluminum surface subjected to cold water droplet impingement is investigated. Evaporation phenomena of a single droplet of pure water is studied for initial surface temperature ranging from 75 to 100 C (implying full suppression of nucleate boiling). The effect of droplet release height, initial surface temperature and, droplet volume on the geometrical configuration of the droplet is investigated. A computer model is developed to predict the cooling effect (volume of influence) induced by a single droplet in contact with the hot surface, using finite difference techniques. A model to predict the evaporation of water droplets deposited on a hot non-porous solid surface is derived."@en
  • "This report describes the research performed during the period July 1990-July 1991 under a joint research program between the Mechanical Engineering Department of the University of Maryland and the Building and Fire Research Laboratory of the National Institute of Standards and Technology. The research is conducted by Graduate Research Assistants of the ME Department under the joint supervision of Dr. di Marzo (UMCP) and Dr. Evans (CFR-NIST). This joint research program was initiated in January 1985. The long term objective of the study of droplet-solid interaction is to obtain information applicable to the extinguishment of fire through a droplet array (e.g. spray). The solids of concern include low thermal conductivity materials, typical of fire applications."
  • "A computer code is developed and tested which simulates the transient evaporation of a single liquid droplet from the surface of a semi-infinite solid subject to radiant heat input from above. For relatively low temperature incident radiation, it is shown that the direct absorption of radiant energy by the droplet can be treated as purely boundary conditions, while a model for higher temperature incident radiation would require the addition of constant heat source terms. The heat equation is numerically coupled between the liquid and solid domains by using a predictor-corrector scheme. Three one-dimensional solution schemes are used within the droplet: a start-up semi-infinite medium solution, a tridiagonal Crank-Nicholson transient solution, and a steady-state solution. The solid surface temperatures at each time step are calculated through careful numerical integration of an axisymmetric Green's functions solution equation with the forcing function given by the past lower droplet surface and solid-vapor boundary heat fluxes. The time step is increased after a sensitive initial period to allow for reasonable run times. Two geometry models are included which give the droplet height as a function of current droplet volume and initial wetted radius; the second allows inclusion of the effects of initial contact angle and receding angle. Using water as the liquid and Macor, a low-thermal conductivity material, as the solid, the program output was compared to the experimental results in this line of research. They correlate well to the experiments in which the critical geometric shape factor and evaporation time were most easily measured."
  • "This report describes the research performed during the period July 1989-July 1990 under a joint research program between the Mechanical Engineering Department of the University of Maryland and the Center for Fire Research of the National Institute of Standards and Technology. The research is conducted by Graduate Research Assistants of the ME Department under the joint supervision of Dr. di Marzo (UMCP) and of Dr. Evans (CFR-NIST). A new experimental set-up for the study of dropwise evaporation in a radiant heat transfer field has been designed, constructed and tested. The various issues of concern such as: steady state solid temperature distribution, radiant heater design and configuration, infrared background noise and post test data manipulation are outlined."

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  • "Transient cooling of a hot surface by droplet evaporation"@en
  • "Transient cooling of a hot surface by droplets evaporation"
  • "Transient cooling of a hot surface by droplets evaporation"@en