Thermal wave propagation in blood perfused tissues under hyperthermia treatment for unique oscillatory heat flux at skin surface and appropriate initial condition

2018 ◽  
Vol 54 (11) ◽  
pp. 3199-3217 ◽  
Author(s):  
Jaideep Dutta ◽  
Balaram Kundu
Keyword(s):  
Heat Flux ◽  
Wave Propagation ◽  
Thermal Wave ◽  
Skin Surface ◽  
Initial Condition ◽  
Hyperthermia Treatment

scholarly journals Analysis of the dual phase lag bio-heat transfer equation with constant and time-dependent heat flux conditions on skin surface

2016 ◽  
Vol 20 (5) ◽  
pp. 1457-1472 ◽  
Author(s):  
Poor Ziaei ◽  
Hassan Moosavi ◽  
Amir Moradi
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Thermal Wave ◽  
Transfer Equation ◽  
Skin Surface ◽  
Time Dependent ◽  
Skin Tissue ◽  
High Heat Flux ◽  
Phase Lag ◽  
Heat Transfer Equation

This article focuses on temperature response of skin tissue due to time-dependent surface heat fluxes. Analytical solution is constructed for DPL bio-heat transfer equation with constant, periodic and pulse train heat flux conditions on skin surface. Separation of variables and Duhamel?s theorem for a skin tissue as a finite domain are employed. The transient temperature responses for constant and time-dependent boundary conditions are obtained and discussed. The results show that there is major discrepancy between the predicted temperature of parabolic (Pennes bio-heat transfer), hyperbolic (thermal wave) and DPL bio-heat transfer models when high heat flux accidents on the skin surface with a short duration or propagation speed of thermal wave is finite. The results illustrate that the DPL model reduces to the hyperbolic model when ?T approaches zero and the classic Fourier model when both thermal relaxations approach zero. However for ?q = ?T the DPL model anticipates different temperature distribution with that predicted by the Pennes model. Such discrepancy is due to the blood perfusion term in energy equation. It is in contrast to results from the literature for pure conduction material, where the DPL model approaches the Fourier heat conduction model when ?q = ?T . The burn injury is also investigated.

scholarly journals Dynamics of Extreme Stratospheric Negative Heat Flux Events in an Idealized Model

2018 ◽  
Vol 75 (10) ◽  
pp. 3521-3540 ◽  
Author(s):  
Etienne Dunn-Sigouin ◽  
Tiffany Shaw
Keyword(s):  
Heat Flux ◽  
Wave Propagation ◽  
Recent Work ◽  
Wave Interaction ◽  
Higher Order ◽  
Negative Events ◽  
Flow Mechanism ◽  
Mean Flow ◽  
Idealized Model

Recent work has shown that extreme stratospheric wave-1 negative heat flux events couple with the troposphere via an anomalous wave-1 signal. Here, a dry dynamical core model is used to investigate the dynamical mechanisms underlying the events. Ensemble spectral nudging experiments are used to isolate the role of specific dynamical components: 1) the wave-1 precursor, 2) the stratospheric zonal-mean flow, and 3) the higher-order wavenumbers. The negative events are partially reproduced when nudging the wave-1 precursor and the zonal-mean flow whereas they are not reproduced when nudging either separately. Nudging the wave-1 precursor and the higher-order wavenumbers reproduces the events, including the evolution of the stratospheric zonal-mean flow. Mechanism denial experiments, whereby one component is fixed to the climatology and others are nudged to the event evolution, suggest higher-order wavenumbers play a role by modifying the zonal-mean flow and through stratospheric wave–wave interaction. Nudging all tropospheric wave precursors (wave-1 and higher-order wavenumbers) confirms they are the source of the stratospheric waves. Nudging all stratospheric waves reproduces the tropospheric wave-1 signal. Taken together, the experiments suggest the events are consistent with downward wave propagation from the stratosphere to the troposphere and highlight the key role of higher-order wavenumbers.

Measurement of the thermal diffusivity of human epidermis by studying thermal wave propagation

1992 ◽  
Vol 37 (1) ◽  
pp. 21-35 ◽  
Author(s):  
U Werner ◽  
K Giese ◽  
B Sennhenn ◽  
K Plamann ◽  
K Kolmel
Keyword(s):  
Wave Propagation ◽  
Thermal Diffusivity ◽  
Thermal Wave ◽  
Human Epidermis

An air flow sensor based on interface thermal wave propagation

1986 ◽  
Vol 59 (1) ◽  
pp. 59-65 ◽  
Author(s):  
David K. Lambert ◽  
Charles R. Harrington
Keyword(s):  
Wave Propagation ◽  
Thermal Wave ◽  
Air Flow ◽  
Flow Sensor

Tissue responses to fractional transient heating with sinusoidal heat flux condition on skin surface

2016 ◽  
Vol 87 (10) ◽  
pp. 1304-1311 ◽  
Author(s):  
Magdy A. Ezzat ◽  
Alaa A. El-bary ◽  
Noorah S. Al-sowayan
Keyword(s):  
Heat Flux ◽  
Skin Surface ◽  
Transient Heating ◽  
Flux Condition ◽  
Tissue Responses

Study on Infrared Thermal Wave Inspection Technology Using Linear Frequency Modulated (LFM) Light Excitation

2012 ◽  
Vol 542-543 ◽  
pp. 659-662
Author(s):  
Li Qiang Liu ◽  
Jun Yan Liu ◽  
Yang Wang
Keyword(s):  
Heat Flux ◽  
Frequency Modulation ◽  
Thermal Wave ◽  
Steel Sample ◽  
Experimental Results ◽  
Linear Frequency ◽  
Wave Imaging ◽  
Light Excitation ◽  
Modulated Light ◽  
Subsurface Defects

This paper provides the theory, mathematics analysis and experiments in support of the Infrared thermal-wave inspection on the subsurface defects in a solid using linear frequency modulated light excitation (LFMTWI). The specimen is heated by the heat flux of linear frequency modulation for launching thermal-wave into the sample in a desired range of frequency. The more thermal wave responses characters are obtained, and the IR thermal-wave imaging shows much more advantages for subsurface defects detection. The simulation and experimental results from steel sample are presented in support of this technique.

Thermal wave propagation in media with thermal memory induced by pulsed laser irradiation

2003 ◽  
Vol 67 (3-4) ◽  
pp. 459-461 ◽  
Author(s):  
S. Galovic ◽  
D. Kostoski ◽  
G. Stamboliev ◽  
E. Suljovrujic
Keyword(s):  
Wave Propagation ◽  
Laser Irradiation ◽  
Thermal Wave ◽  
Pulsed Laser ◽  
Thermal Memory ◽  
Pulsed Laser Irradiation
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