Study of air flow in hollow bricks using holographic interferometry

C. Vennin, John Watson, Mohammed Salah-Eldin Imbabi

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution


Natural convection is a topic of considerable interest in many engineering applications. To improve the thermal insulation of walls, hollow bricks in which this kind of convection occurs could be used. Thus a good understanding of the free convection of the air inside this type of bricks is valuable. Theoretical studies consisting of computer simulation have already been carried out and give a good understanding of the flow movement, velocity, and temperature variation in different types of fluids.1-2 The aim of our study was to perfect a good holographic interferometric method to visualise the isothermal lines of a free air flow convection inside a hollow brick. By viewing and understanding the heat transfer inside, it will be possible to define a cavity shape that reduces heat exchange between the cold outdoor and the hot indoor surface (and vice versa). The hollow brick cavity dimensions were 180 × 60 × 60 mm, two walls were in aluminium, two in Tuffnal and the two windows were in a Plexiglas. Temperature differences, ΔT, of 7 to 30°C were obtained with the heater on the vertical side. The temperature was measured with four thermocouples inside the two aluminium walls.
Original languageEnglish
Title of host publicationProceedings of the IEEE Conference on Lasers and Electro-Optics Europe (CLEO '94) - Technical Digest, Amsterdam, The Netherlands
PublisherOptica Publishing Group
Publication statusPublished - 1994
EventThe European Conference on Lasers and Electro-Optics 1994 - Amsterdam, Netherlands
Duration: 28 Aug 19942 Sept 1994


ConferenceThe European Conference on Lasers and Electro-Optics 1994
Abbreviated titleCLEO 1994


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