Chlazení horkých povrchů s různou orientací

Nozzle cooling of hot surfaces with various orientations

conference paper

en

The aim of this research is an investigation of hot surface orientation influence on heat transfer during cooling by a nozzle. Two types of nozzles were used for the experiments (air-mist nozzle and hydraulic nozzle). A test plate was cooled in three positions – top, side and bottom position. The aim was to simulate a cooling situation in the secondary zone of a continuous casting machine. Temperature was measured in seven locations under the cooled surface by thermocouples. These data were used for an inverse heat conduction problem and then boundary conditions were computed. These boundary conditions are represented by surface temperature, heat transfer coefficient and heat flux. Results from an inverse calculation were compared in each position of thermocouples separately. The total cooling intensity was specified for all configurations of nozzles and test plate orientation. Results are summarised in a graphical and numerical format.

Cílem tohoto výzkumu je zkoumání vlivu orientace horkých povrchů na přestup tepla během chlazení tryskou. Pro experimenty byly použity dva typy trysek – vodovzdušná a vodní. Zkušební deska byla chlazena postupně ve třech pozicích – shora, ze strany a zdola. Cílem bylo simulovat chlazení v sekundární zóně kontinuálního lití. Teplota byla měřena termočlánky umístěnými na sedmi místech pod chladícím povrchem. Naměřená data byla použita pro inverzní úlohu vedení tepla, pomocí které byly spočítány okrajové podmínky. Těmi jsou povrchová teplota, součinitel přestupu tepla a tepelný tok. Výsledky z inverzní úlohy byly srovnány pro jednotlivé pozice termočlánků. Celková intenzita chlazení byla specifikována pro všechny konfigurace trysek a orientace chlazeného povrchu. Výsledky jsou shrnuty v grafech a numerickém formátu.

The aim of this research is an investigation of hot surface orientation influence on heat transfer during cooling by a nozzle. Two types of nozzles were used for the experiments (air-mist nozzle and hydraulic nozzle). A test plate was cooled in three positions – top, side and bottom position. The aim was to simulate a cooling situation in the secondary zone of a continuous casting machine. Temperature was measured in seven locations under the cooled surface by thermocouples. These data were used for an inverse heat conduction problem and then boundary conditions were computed. These boundary conditions are represented by surface temperature, heat transfer coefficient and heat flux. Results from an inverse calculation were compared in each position of thermocouples separately. The total cooling intensity was specified for all configurations of nozzles and test plate orientation. Results are summarised in a graphical and numerical format.

Chlazení, orientace plochy, trysky, inverzní úloha vedení tepla, okrajové podmínky.

Cooling, surface orientation, nozzles, inverse heat conduction problem, boundary conditions.

2011

22.11.2011

Jičín

978-80-7372-784-0

Experimental fluid Mechanics 2011

1

337–346

10