Analysis of a transient heat transfer experiment in a two pass internal coolant passage

Transient Analysis of Transverse Ribbed Rectangular Duct by Liquid Crystal Thermography

“…Reynolds number (Re=8070) and mass flow rate were kept constant for all tests. The variation of nusselt number for both the positions is shown in figure (4)(5). From fig.…”

“…They gave a map of thermal field in their form of colour change during natural convection over a vertical surface, and also provided a relative investigation between steady and transient method to determine convective heat transfer coefficient. Transient study on smooth and the transverse ribbed surface was done in [1], [3], and [4]. In [2] TLCs with constant bandwidth of different temperature range 28-33, 33-38, 38-43 and 45-50 o C were used the temperature changes micro circular channel flow, at level of uncertainty of ± 0.4 o C. Hue-temperature calibration is the important part of LCT literature [1] and [5] show full details of calibration.…”

“…Both the literature assures the variation of hue, value increases with increasing of surface temperature. Variations of hue with temperature at different location have been found in [2] and [4]. Transient analysis was done by [3] in turbine cooling by impingement jet on transverse roughened duct.…”

Thermocouple thermal inertia effects on impingement heat transfer experiments using the transient liquid crystal technique

“…The heater mesh is attached to copper electrodes and covers the whole flow path of the plenum upstream of the impingement plate composing an effective heating area of 520 × 150 mm 2 . Such configurations have been successfully used by ITLR (Universität Stuttgart) and GTT (EPFL) over the last 10 years in various dimensions [27][28][29][30]. The power in the mesh is supplied through a 30 kW dc-power supply (500 A, 60 V), while a first estimation of the temperature step can be made through the energy balance since almost all the electrical energy is converted into heat input into the flow:…”