Infrared temperature measurements in micro-channels and micro-fluid systems

Quantitative evaluation of spatio-temporal heat transfer to a turbulent air flow using a heated thin-foil

“…Then, using a space difference Dx (=Dz), the heat transfer coefficient was calculated again from Eqs. (5) and (6). As shown in Fig.…”

“…The similarities of the fluctuating pattern in the time trace and its power spectrum indicate the plausibility of the present IRT measurement and the inverse heat conduction calculation of Eqs. (5) and (6). From another point of view, it is reasonable to say that the characteristics in the fluctuating pattern are almost independent of the thermal boundary condition.…”

“…Then, using a time step Dt, the heat transfer coefficient was calculated from Eqs. (5) and (6). The ratio of fluctuating amplitude of h, calculated here against the original, was defined as a temporal restoration ratio g. The result is plotted in Fig.…”

“…[6], Golobic et al [7], Stafford et al [8]). Although the temperature variation in the thermo-images is attenuated in time and space because of thermal inertia and lateral conduction of the solid wall, it is possible to restore the quantitative heat transfer by solving the inverse heat conduction equation.…”

Local instantaneous heat transfer around a rising single Taylor bubble

“…Chang and Yang [18] examined experimentally the two-phase flow structure and heat transfer performance for air-water slug flow in a vertical pipe. Recently, some experimental [19][20][21][22][23][24][25][26] and numerical [27][28][29][30] efforts were dedicated to the determination of local heat transfer during gas-liquid elongated bubble flow in minichannels.…”