Optimized Jet Impingement Heat Transfer with Reduced Splatter

Details

• Personal Author:
  Jog MA ; Manglik RM ; Rajendran S
• Description:
  Understanding and being able to manipulate the drop distribution emerging from an impinging jet splattering on a heated surface finds many practical applications. When cutting fluid hits the heated site of a surface being machined, the drops sprayed would be subjected to sudden evaporation. The resultant mist could be inhaled by the workers in the vicinity and is harmful. The goal of the proposed research is to investigate the formation of droplets and aim at creating a model that accounts for fluid properties, nozzle geometry, angle of incidence and the ambient conditions. This will help minimize the splatter during jet impingement process and provide an optimum working condition without compromising on providing cooling at the machining site. The model developed can be of use in other industries such as fertilizer treatment, spray coating and in annealing of metals, where, if the drop sizes are too small, probability of spray and contact is more. An experimental set-up consisting of jet impinging on a surface maintained at a constant heat flux will be used. The flow rate of the jet can be controlled using a pressure regulator and flow control valves. Infra Red camera placed at an appropriate location near the heated surface will help gauge the effectiveness of cooling by jet impingement. A high speed digital camera will be used to capture the drop distribution and splatter. Numerical modeling of the same phenomena will be done on OpenFOAM. The experimental results will aid in perfecting the numerical model which will be used to study the influence of ambient conditions. This will then enable us to modify the test parameters and see its effect on drop distribution and cooling efficiency. The model thus developed, can then be integrated with the research on drop spreading and phase change on impact with a heated surface done in our laboratory. A consolidation of these two, will then help us see the generation and spreading of mist on jet impingement. The model thus developed can then be used to optimize the effects of jet impingement based on the application which could range from pesticide control to drug delivery. Finally, we hope to provide a means to reduce splatter and contact on the operators present. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Hot Temperature Inhalation Exposure Occupational Health Safety
• Keywords:
  Airborne Particles Air Contaminants Fluids Heat Inhalants Jets Machine Tools
• Publisher:
  University of Cincinnati
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1
• NIOSHTIC Number:
  nn:20052527
• Citation:
  14th Annual Pilot Research Project Symposium, University of Cincinnati Education and Research Center, October 10-11, 2013, Cincinnati, Ohio. Cincinnati, OH: University of Cincinnati, 2013 Oct; :1
• Email:
  rajendsa@mail.uc.edu
• Federal Fiscal Year:
  2014
• Performing Organization:
  University of Cincinnati
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  14th Annual Pilot Research Project Symposium, University of Cincinnati Education and Research Center, October 10-11, 2013, Cincinnati, Ohio
• End Date:
  20260630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ff4dd404a262a3e0077ef0a77f6bd0092a6a8acdaa3e0f0b56e18fabbc7a4f7042405d614500142a74bec68bebdaf2f93ee9fe951dfbfb2772e063db65f6e8ca
• Download URL:
  https://stacks.cdc.gov/view/cdc/212040/cdc_212040_DS1.pdf
• File Type:
  [PDF - 69.37 KB ]