Enhancement and Local Regulation of Metal Quenching Using Atomized Sprays / Umair Alam, Jacek Krol, Eckehard Specht, J¿̐ưrgen Schmidt
- Conference Author:
- Advances in the State of the Art of Fire Testing (2008 : Miami Beach, FL)
- Physical Description:
- 1 online resource (13 pages) : illustrations, figures, tables
- Additional Creators:
- Specht, Eckehard, Alam, Umair, King, Jack (Novelist), Schmidt, J¿̐ưrgen, American Society for Testing and Materials, and ASTM International
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- Subscription required for access to full text. and License restrictions may limit access.
- In atomized spray quenching, the spraying water is atomized into fine droplets of the size of about 20 ?m by compressed air and sprayed onto a hot surface. Only single droplets touch the surface, become deformed, and transfer heat. The drops partially evaporate and then move away from the superposed airflow. Thus, the vapor film is avoided as it is the case for other quenching techniques. It is demonstrated that the unintended collapses of the vapor film (Leidenfrost problem) at edges, corners, roughness peaks, etc., is eliminated by this technique. In this way, mass lumped regions of work pieces can be cooled more intensively than the edges. Consequently, a uniform temperature distribution with reduced thermal stresses can be obtained. The heat transfer was measured by infrared thermography. One side of the metallic sheet of 3 mm thickness was quenched by atomized spray and the surface temperature was measured on other side by an IR camera. The heat transfer coefficient is mainly determined by the impingement density. Heat transfer coefficient of 10,000 W/m2/K can be achieved within film boiling regime. This value is about three times higher than that of conventional spray quenching.
- Dates of Publication and/or Sequential Designation:
- Volume 2010, Issue 1523 (January 2010)
- 9780803184176 (e-ISBN) and 9780803175099
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 11.
- Other Forms:
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription., Full text article also available for purchase., and Also available in PDF edition.
- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2010. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
- Source of Acquisition:
- ASTM International PDF Purchase price USD25.
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