Applicability of Temperature Sensitive Paints for Measurement of Surface Temperature Distribution

2003 ◽  
Author(s):  
Q. Liu ◽  
J. S. Kapat ◽  
C. J. Douglass ◽  
J. Qiu
Keyword(s):  
Temperature Distribution ◽  
Surface Temperature ◽  
Room Temperature ◽  
Jet Impingement ◽  
Calibration Procedure ◽  
Temperature Sensitive ◽  
Operational Parameters ◽  
Target Plate ◽  
Surface Temperature Distribution ◽  
Acrylic Plate

Temperature sensitive fluorescent paints (TSP) provide a non-intrusive method for surface temperature measurement. The objective of this research is to identify application and operational parameters that have impact on the TSP calibration curve and demonstrate the method on a jet impingement experiment. In particular, the effects of painting process and lighting and viewing conditions are reported in this paper. TSPs are made by dissolving a polymer and fluorophore in a common solvent. The resulting liquid can be sprayed or brushed onto a surface. A calibration procedure and apparatus have been devised to calibrate the emission intensity of the fluorescent paints as a function of temperature. TSP has been calibrated between room temperature and 63°C. It is found that over this temperature range, calibration curves are within ± 0.8°C of each other irrespective of the number of paint coats (provided at least 3 coats are applied) and viewing and lighting angles. The TSP technique has been applied to a hot jet impinging on a transparent acrylic plate. The impingement side of the acrylic plate is coated with TSP that determines the instantaneous surface temperature distribution. The target plate was placed at 6 jet diameters from the nozzle. The temperature distribution obtained from the TSP clearly shows the stagnation area and flow transition of jet impingement flow.

scholarly journals Broiler surface temperature distribution of 42 day old chickens

2010 ◽  
Vol 67 (5) ◽  
pp. 497-502 ◽  
Author(s):  
Irenilza de Alencar Nääs ◽  
Carlos Eduardo Bites Romanini ◽  
Diego Pereira Neves ◽  
Guilherme Rodrigues do Nascimento ◽  
Rimena do Amaral Vercellino
Keyword(s):  
Temperature Distribution ◽  
Surface Temperature ◽  
Air Temperature ◽  
Broiler Chickens ◽  
Broiler Chicken ◽  
Growth Period ◽  
The Body ◽  
Body Parts ◽  
Surface Temperature Distribution ◽  
Thermographic Image

Broiler chickens in Brazil are generally reared from 1 to 42 days when they are exposed to procedures such as fasting, harvesting, crating and transport to slaughter. Maintaining homeostasis is of great importance for broiler survival under harsh environment especially prior to slaughter. Heat loss varies in the distinct parts of the body during the growth period, and it is related to the air temperature of the environment and to the amount of feather covering. This research aimed to study the surface temperature distribution using infrared thermographic image processing to characterize 42 day old broiler chicken surface temperature prior to slaughter. Broilers were reared for 42 days and prior to harvest and transport to slaughter the infrared surface temperature was recorded along the day. Data from the thermograms taken in feather and featherless regions were compared during the 42nd day of growth. High correlation between featherless regions and air temperature was found showing that these areas respond fast to changes in the rearing environment. Two functions were developed for predicting both surface temperature for featherless and feather covered areas of the broiler body parts.

scholarly journals Surface Temperature Distribution Characteristics of Marangoni Condensation for Ethanol–Water Mixture Vapor Based on Thermal Infrared Images

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 6057
Author(s):  
Guilong Zhang ◽  
Ziqiang Ma ◽  
Heng Li ◽  
Jinshi Wang
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Surface Temperature ◽  
Thermal Infrared ◽  
Water Mixture ◽  
Distribution Characteristics ◽  
Infrared Images ◽  
Single Droplet ◽  
Surface Temperature Distribution ◽  
Thermal Infrared Images

Marangoni condensation is formed due to the surface tension gradient caused by the local temperature or concentration gradient on the condensate surface; thus, the investigation of the surface temperature distribution characteristics is crucial to reveal the condensation mechanism and heat transfer characteristics. Few studies have been conducted on the temperature distribution of the condensate surface. In this study, thermal infrared images were used to measure the temperature distributions of the condensate surface during Marangoni condensation for ethanol–water mixture vapor. The results showed that the surface temperature distribution of the single droplet was uneven, and a large temperature gradient, approximately 15.6 °C/mm, existed at the edge of the condensate droplets. The maximum temperature difference on the droplet surface reached up to 8 °C. During the condensation process, the average surface temperature of a single droplet firstly increased rapidly and then slowly until it approached a certain temperature, whereas that of the condensate surface increased rapidly at the beginning and then changed periodically in a cosine-like curve. The present results will be used to obtain local heat flux and heat transfer coefficients on the condensing surface, and to further establish the relationship between heat transfer and temperature distribution characteristics.

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