Naslov
Analysis of Surface Temperature Measurement Errors in Vertical Natural Convection Cooled Channels

Autori
Zvizdić, Davor ; Grgec Bermanec, Lovorka

Izvornik
AIP conference proceedings (0094-243X) 7 (2003), 2; 1103-1108

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
surface temperature; measurement

Sažetak
This paper describes iterative methodology for calculation of surface temperature measurement errors applied to symmetrically heated, vertical parallel plate channels. Heat transfer calculations within the channel (marching, control volume based, numerical procedure) are first based on initial raw and uncorrected surface temperature measurements. Those data are then utilized for determination of surface measurement errors modeled with emphasis on thermocouple induced local heat sink and convective stray looses. The new, corrected surface temperatures are then input to heat transfer calculations until satisfactory convergence. The scope of the methodology is investigated by it’ s application to surface measurement error estimation for several groups of channels, each group having different, but fixed height, and variable aspect ratio. The mutual influences of channel geometry and wall temperatures on surface measurement errors at various measurement locations along the channel height are analyzed with results presented in graphical form. It was found that close to the channel entrance errors tend to be significantly augmented due to thermo-siphon induced convective stray looses. As thermal boundary layers approach and meet, errors monotonically decrease and cease to exist in thermally saturated channel sections. It was also found that, because of the non-linearity, the channels with the same aspect ratio but different height, induce different convective stray looses to the sensors.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA