A primary mechanism of heat transfer in spray cooling is the impingement of numerous droplets onto a heated surface. This mechanism is isolated in the present and ongoing work by numerically simulating the impact of a single train of FC-72 droplets employing an implicit free surface capturing methodology. The droplet frequency and velocity ranges from 2000–4000 Hz, and 0.5–2 m/s, respectively, with a fixed drop size of 239 μm. This gives a corresponding Weber and Reynolds range of 10–170 and 330–1300, respectively. Results show that the impingement zone is largely free of phase change effects due to the efficient suppression of the local temperature field well below the saturated value. Due in part to the relatively high value of the Prandtl number and the compression of the boundary layer from the impingement flow, a cell size on the order of 1 μm is necessary to adequately capture the heat transfer dynamics. It is shown that the cooling behavior increases in relation to increasing frequency and impact velocity, but is most sensitive to velocity. In fact, for sufficiently low velocities the calculations show that the momentum imparted on the film is insufficient to maintain a near stationary liquid crown. The consequence is a noticeable penalty on the cooling behavior.
Skip Nav Destination
2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4941-5
PROCEEDINGS PAPER
Numerical Simulation of Heat Transfer Mechanisms in Spray Cooling
Eelco Gehring,
Eelco Gehring
University of Wisconsin-Madison, Madison, WI
Search for other works by this author on:
Mario F. Trujillo
Mario F. Trujillo
University of Wisconsin-Madison, Madison, WI
Search for other works by this author on:
Eelco Gehring
University of Wisconsin-Madison, Madison, WI
Mario F. Trujillo
University of Wisconsin-Madison, Madison, WI
Paper No:
IHTC14-22709, pp. 747-754; 8 pages
Published Online:
March 1, 2011
Citation
Gehring, E, & Trujillo, MF. "Numerical Simulation of Heat Transfer Mechanisms in Spray Cooling." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 6. Washington, DC, USA. August 8–13, 2010. pp. 747-754. ASME. https://doi.org/10.1115/IHTC14-22709
Download citation file:
13
Views
Related Proceedings Papers
Related Articles
A Numerical Model for the Mist Dynamics and Heat Transfer at Various Ambient Pressures
J. Fluids Eng (July,2005)
Effects of High Frequency Droplet Train Impingement on Crown Propagation Dynamics and Heat Transfer
J. Heat Transfer (February,2016)
The Effect of Dissolving Salts in Water Sprays Used for Quenching a Hot Surface: Part 2—Spray Cooling
J. Heat Transfer (April,2003)
Related Chapters
Numerical Simulation of Nucleate Spray Cooling: Effect of Droplet Impact on Bubble Growth and Heat Transfer in a Thin Liquid Film
Inaugural US-EU-China Thermophysics Conference-Renewable Energy 2009 (UECTC 2009 Proceedings)
Laminar Fluid Flow and Heat Transfer
Applications of Mathematical Heat Transfer and Fluid Flow Models in Engineering and Medicine
Dynamic Behavior of Pumping Systems
Pipeline Pumping and Compression Systems: A Practical Approach