Theory of transient experimental techniques for surface heat transfer

Taler, Jan

doi:10.1016/0017-9310(96)00015-4

Cited by 100 publications

(39 citation statements)

References 18 publications

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“…Inasmuch as thermal boundary conditions such as a time-varying heat¯ux (q(t)) are dif®cult to measure directly, indirect techniques using internal temperature measurements are often used [24]. With these techniques, an inverse heat conduction problem (IHCP) is solved to estimate the boundary condition from internal temperature measurements.…”

Section: Heat Removal Estimationmentioning

confidence: 99%

Cryogen spray cooling: Effects of droplet size and spray density on heat removal

et al. 2001

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Section: Heat Removal Estimationmentioning

confidence: 99%

Cryogen spray cooling: Effects of droplet size and spray density on heat removal

et al. 2001

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“…Tunnell et al (2002) provided a detailed discussion on the accuracy of this method as applied to CSC. Independent of the IHC algorithm, measured temperature data are smoothed by a digital filter (Taler 1996, Aguilar et al 2003b to remove random noise. Aguilar et al (2003bAguilar et al ( , 2003c have shown the effect of spurt duration ( t) and z on CSC when T 0 was room temperature (∼20 • C).…”

Section: Mathematical Model and Inverse Heat-transfer Algorithmmentioning

confidence: 99%

Heat-transfer dynamics during cryogen spray cooling of substrate at different initial temperatures

et al. 2004

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Cryogen spray cooling (CSC) is used to minimize the risk of epidermal damage during laser dermatologic therapy. However, the dominant mechanisms of heat transfer during the transient cooling process are incompletely understood. The objective of this study is to elucidate the physics of CSC by measuring the effect of initial substrate temperature (T 0 ) on cooling dynamics. Cryogen was delivered by a straight-tube nozzle onto a skin phantom. A fast-response thermocouple was used to record the phantom temperature changes before, during and after the cryogen spray. Surface heat fluxes (q ) and heat-transfer coefficients (h) were computed using an inverse heat conduction algorithm. The maximum surface heat flux (q max ) was observed to increase with T 0 . The surface temperature corresponding to q max also increased with T 0 but the latter has no significant effect on h. It is concluded that heat transfer between the cryogen spray and skin phantom remains in the nucleate boiling region even if T 0 is 80 • C.

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“…Furthermore, as the thermal penetration depth during the experimental run times is small compared to the linear dimension of the thermal sensor, the system can be modeled by considering unsteady, linear conduction of heat in a onedimensional semi-infinite solid [20]. In order to use (2), it is desirable to have a closed form solution of transient temperature data obtained from the captured experimental signals [10].…”

Section: Heat Fluxmentioning

confidence: 99%

“…As an outcome of this experiment, presently, using E-type thermocouple is seen to have thermal product of 9493 J⋅m −2 ⋅K −1 ⋅s −0.5 . Generally, for such short duration time scale applications, heat transfer rates can be recovered from the transient temperature data, through the use of appropriate modeling of (2) with assumption of one-dimensional heat conduction [19,20]:…”

Section: Heat Fluxmentioning

confidence: 99%

Shock Tube as an Impulsive Application Device

Nanda

Agarwal

Kulkarni

et al. 2017

International Journal of Aerospace Engineering

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Current investigations solely focus on application of an impulse facility in diverse area of high-speed aerodynamics and structural mechanics. Shock tube, the fundamental impulse facility, is specially designed and calibrated for present objectives. Force measurement experiments are performed on a hemispherical test model integrated with the stress wave force balance. Similar test model is considered for heat transfer measurements using coaxial thermocouple. Force and heat transfer experiments demonstrated that the strain gauge and thermocouple have lag time of 11.5 and 9 microseconds, respectively. Response time of these sensors in measuring the peak load is also measured successfully using shock tube facility. As an outcome, these sensors are found to be suitable for impulse testing. Lastly, the response of aluminum plates subjected to impulsive loading is analyzed by measuring the in-plane strain produced during deformation. Thus, possibility of forming tests in shock is also confirmed.

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Theory of transient experimental techniques for surface heat transfer

Cited by 100 publications

References 18 publications

Cryogen spray cooling: Effects of droplet size and spray density on heat removal

Cryogen spray cooling: Effects of droplet size and spray density on heat removal

Heat-transfer dynamics during cryogen spray cooling of substrate at different initial temperatures

Shock Tube as an Impulsive Application Device

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