Approaches to extract thermal properties from dual-thermistor heat pulse experimental data

Abstract

Experimental data of temperature versus time obtained by dual-thermistor heat pulse equipment can be analysed by two approaches to find the thermal diffusivity and the thermal conductivity. One, referred to as the peak point approach, is based on accurate identification of the peak point in the temperature versus time measurement. The other is a nonlinear fit approach by comparing the theoretical model with the experimental data. A sensitivity analysis is performed to define an optimal measurement time interval with a desired uncertainty limit for the nonlinear data fit. The experimental design can also be optimized from the sensitivity analysis. A comparison of the two approaches is presented according to the results of data processing.

An improved hot probe for measuring thermal conductivity of liquids

“…The hot wire and hot probe are both transient techniques based on a linear heat source for measurement of thermal conductivity [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Compared with other methods [19][20][21][22][23], the former is well known for its accuracy, while the latter is widely used for soft media because it is convenient.…”

Increasing accuracy of measuring thermal conductivity of liquids by using the direct heating thermistor method

“…These methods of determining TPC of liquids and materials are the basis for the research into the magnitude of perfusion (transmission of solutions and biologically active substances through the vascular system of organs and tissues of the human body) by using thermistors [10], measurement of thermal conductivity of liquids and powders by using thermistor probe [11], as well as determining heat pulses with the help of thermistor probes [12].…”

Tilted Fiber Bragg Grating Active Heater for Controlled and Localised Hyperthermia

“…The simulation gives a solution for the governing equation to provide a As its value goes tighter, the solution accuracy increases at the expense of the computational time for a given mesh. In our case, this value is good enough because the inputs (material properties) in our model are approximate values [259][260][261][262][263][264][265][266][267][268][269]. The biological tissues properties vary between individuals, due to different age and health status for example.…”

“…Ascertaining the extent of thermal damage and its degree in tissue is required from the heat transfer models of hyperthermia [259][260][261][262][263][264][265][266][267][268][269][270][271][272][273][274][275]. Accurate estimation of these thermal properties is imperative to determine the heat transfer and its effect on a biological system.…”