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ABSTRACT
The present article discusses the experimental results on cooling characteristics of a stationary hot steel plate by spray impingement. The experimental setup consisted of an electrically heated flat stationary steel plate of dimension 120 mm × 120 mm × 4 mm, spray setup, water supply, and air supply unit. The effects of various controlling parameters such as air-water pressures, water flow rate, nozzle tip to target distance and impingement density were determined and analyzed. The cooling rates were computed from the time-dependent temperature history and used to analyze the parametric effects. The results obtained in the study confirmed the higher efficiency of the spray cooling system and the cooling strategy was found advantageous over the conventional cooling methods available in the open literature.
| Nomenclature | ||
| B | = | Bias error |
| CR | = | Cooling rate,°C/sec |
| CR* | = | Nondimensional cooling rate |
| h | = | height |
| l | = | Length of the steel plate, m |
| LPH | = | Liter per hour |
| lt | = | Liter |
| MID | = | mass impingement density |
| Nu | = | Nusselt number |
| P | = | Pressure, bar |
| Ra | = | Arithmetic average of the roughness profile, microns |
| S | = | Precision error |
| t | = | Time, Sec |
| t* | = | Nondimensional time |
| T | = | Temperature of the plate,°C |
| Tc | = | Temperature of cooling water,°C |
| TC | = | Thermocouple |
| Greek symbols | ||
| α | = | Coefficient of thermal expansion,°C−1 |
| ΔT | = | Measured temperature difference,°C |
| ΔT* | = | Nondimensional temperature difference |
| Subscripts | ||
| w | = | water |
| a | = | air |
| Superscripts | ||
| * | = | dimensionless |
Additional information
Notes on contributors
Santosh K. Nayak
Santosh Kumar Nayak is an Assistant professor in the School of Mechanical Engineering, KIIT University, Odisha, India. He received his Ph.D. degree in 2016 from KIIT University, Bhubaneswar, Odisha, India. He is currently working on impingement cooling of hot metal strips in run out table.
Purna C. Mishra
Purna Chandra Mishra is a professor in the School of Mechanical Engineering, KIIT University, Bhubaneswar, Odisha, India. He is the director of R&D, School of Technologies, KIIT University. He received his Ph.D. degree in 2009 from Jadavpur University, Kolkata. He was previously senior research scientist at BARC (Baba Atomic Research Center), Govt. of India, Mumbai, Engineering Sciences Division.
Manoj Ukamanal
Manoj Ukamanal is an Assistant professor in School of Mechanical Engineering, KIIT University, Bhubaneswar, Odisha, India. He received his M.Tech degree in 2014 from KIIT University, Bhubaneswar, Odisha, India, in Thermal Engineering. He was previously an analyst engineer in TATA Consultancy Services, Pune, India. He is currently pursuing his Ph. D. under the supervision of Dr. Purna Chandra Mishra.
Rajeswari Chaini
Rajeswari Chaini is currently working as an Assistant Professor in Department of Mechanical Engineering, GIFT, Bhubaneswar, Odisha, India. She did her M. Tech. in 2014 from KIIT University, Bhubaneswar, Odisha, India, in Thermal Engineering. She was actively involved in the spray cooling experimentation. She has 3 international journal and 3 conference publications.
