Experiment

Experiment

A.022

Experiment

Three-dimensional Marangoni convections

Primary investigator

Janssen, L.P.B.M.

Co-investigator

Hoefsloot, H.C.J.

Contact point

State University Groningen, Department of Chemical Engineering

Category

Fluid Sciences

Main research area

Marangoni convection

Objectives

Objectives:
Marangoni convection cells generated by mass transfer in the liquid bulk around a bubble had been observed in previous microgravity experiments. The aim of this experiment was to assess the influence of the bubble diameter on the convective patterns.

Reference

ESA SP-1132

Experiment procedure

Experimental procedure and results:

In microgravity, air bubbles were created between two pipes in three containers of 4 cm in inner diameter and in depth filled with a 3 vol % acetone-water solution. The distance between the pipes was 3.5 and 7 mm .... (full text)

Results

Large torus-shaped convective patterns developed quickly around the 7 mm and the 5 mm bubbles (fig.1). The velocities close to the interface were of the order of 3 cm/s. In contrast, convective flows started only slowly around the 3 mm bubble and were rather unstable. .... (full text)

Funding agency

ESA, SRON

Launcher

Maser sounding rocket

Mission

Maser-2

Facility

Fluid Science Module

Duration

7 minutes

Equipment

Maser-2 equipment

Pictures

(Convection flow pattern)

(Single-spot convection)

(Picture from CCD camera during flight)