The complex airflow in convection ovens directly influences the heat transferred to the product placed inside, thereby affecting product quality. Characterization of related airflow profiles can provide scientific understanding for improvement of oven designs as well as important parameters for simulation of involved thermal processes. In this study, the particle-imaging velocimetry (PIV) technique was applied to visualize airflow inside a household convection oven with samples placed at three different locations on a baking tray. The oven cavity was modified for optical access, and airflow was measured at room temperature. A 30 mW green laser was used for illuminating tracer particles in a laser sheet that were generated using incense sticks. The flow patterns were captured using a high-speed camera at 1000 fps. The vorticity and turbulent kinetic energy parameters derived from velocity fields reflected adequate mixing of air inside the cavity. The computed heat transfer coefficient distribution from the boundary layer flow fields to the sample surface ranged between 2.0 and 18.3 W m−2 K−1. The results showed separation of the laminar boundary layer from the object surface at angles of 85°–90°. The PIV-algorithms and boundary layer flow derived parameters developed in this study can be used for refined characterization of complex air or gas flows and related heat transfer characteristics in closed cavity convection ovens and the like arrangements.
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October 2019
Research Article|
October 28 2019
Impact of airflow on the heat transfer conditions inside an oven cavity, characterized using particle imaging velocimetry
Special Collection:
Food and Fluids
Anubha Garg;
Anubha Garg
1
Laboratory of Food Process Engineering, ETH Zürich
, Schmelzbergstrasse 9, 8092 Zürich, Switzerland
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Chandrima Shrivastava;
Chandrima Shrivastava
1
Laboratory of Food Process Engineering, ETH Zürich
, Schmelzbergstrasse 9, 8092 Zürich, Switzerland
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Yuichi Murai;
Yuichi Murai
2
Laboratory of Flow Control, Faculty of Engineering, Hokkaido University
, N13W8 Sapporo, Hokkaido, Japan
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Erich J. Windhab
Erich J. Windhab
1
Laboratory of Food Process Engineering, ETH Zürich
, Schmelzbergstrasse 9, 8092 Zürich, Switzerland
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Note: This paper is part of the Special Topic on Food and Fluids.
Physics of Fluids 31, 107109 (2019)
Article history
Received:
August 05 2019
Accepted:
October 09 2019
Citation
Anubha Garg, Chandrima Shrivastava, Yuichi Murai, Erich J. Windhab; Impact of airflow on the heat transfer conditions inside an oven cavity, characterized using particle imaging velocimetry. Physics of Fluids 1 October 2019; 31 (10): 107109. https://doi.org/10.1063/1.5122800
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