scholarly journals Heat Transfer in Health and Healing1

2015 ◽  
Vol 137 (10) ◽  
Author(s):  
Kenneth R. Diller
Keyword(s):  
Heat Transfer ◽  
Personal Control ◽  
The Body ◽  
Heat Transfer Analysis ◽  
Control Surface ◽  
Body Core Temperature ◽  
Temperature Control System ◽  
Temperature Modulation ◽  
Analysis And Design ◽  
Anesthetic Agents

Our bodies depend on an exquisitely sensitive and refined temperature control system to maintain a state of health and homeostasis. The exceptionally broad range of physical activities that humans engage in and the diverse array of environmental conditions we face require remarkable strategies and mechanisms for regulating internal and external heat transfer processes. On the occasions for which the body suffers trauma, therapeutic temperature modulation is often the approach of choice for reversing injury and inflammation and launching a cascade of healing. The focus of human thermoregulation is maintenance of the body core temperature within a tight range of values, even as internal rates of energy generation may vary over an order of magnitude, environmental convection, and radiation heat loads may undergo large changes in the absence of any significant personal control, surface insulation may be added or removed, all occurring while the body's internal thermostat follows a diurnal circadian cycle that may be altered by illness and anesthetic agents. An advanced level of understanding of the complex physiological function and control of the human body may be combined with skill in heat transfer analysis and design to develop life-saving and injury-healing medical devices. This paper will describe some of the challenges and conquests the author has experienced related to the practice of heat transfer for maintenance of health and enhancement of healing processes.

A 3D SHAPE OPTIMIZATION PROBLEM IN HEAT TRANSFER: ANALYSIS AND APPROXIMATION VIA BEM

2006 ◽  
Vol 16 (08) ◽  
pp. 1243-1270 ◽  
Author(s):  
ANTONELLA ABBÀ ◽  
FAUSTO SALERI ◽  
CARLO D'ANGELO
Keyword(s):  
Heat Transfer ◽  
Shape Control ◽  
Adjoint Equation ◽  
Optimal Shape ◽  
Heat Transfer Analysis ◽  
Industrial Plant ◽  
Flame Surface ◽  
Cost Functional ◽  
Analysis And Design ◽  
Flame Shape

In this paper an optimal shape control problem dealing with heat transfer in enclosures is studied. We have considered an enclosure heated by a flame surface (taking into account radiation, conduction and convection effects), and we look for an optimal flame shape which minimizes a cost functional defined on the temperature field. This kind of problem arises in industrial furnaces optimization, as temperature uniformity is one of the most important aspects in industrial plant analysis and design. Analytical results (smoothness of the control-to-state mapping, existence of an optimal shape in a certain admissible class) as well as numerical optimization results by the boundary element method have been obtained; we have employed the gradient method to optimize the flame shape, exploiting the adjoint equation associated with our state equation and cost functional.

Inverse Heat Transfer Analysis of Micro Heater Strength and Locations for Hyperthermia Treatment of Brain Tumors

2007 ◽  
Author(s):  
Maral Biniazan ◽  
Kamran Mohseni
Keyword(s):  
Heat Transfer ◽  
Brain Tumors ◽  
Transfer Problem ◽  
The Body ◽  
Least Square ◽  
Bioheat Transfer ◽  
Heat Transfer Analysis ◽  
Whole Body ◽  
Transient Temperature ◽  
Inverse Heat Transfer

Hyperthermia, also called thermal therapy or thermotherapy, is a type of cancer treatment in which the aim is to maintain the surrounding healthy tissue at physiologically normal temperatures and expose the cancerous region to high temperatures between 43°C–45°C. Several methods of hyperthermia are currently under study, including local, regional, and whole-body hyperthermia. In local hyperthermia, Interstitial techniques are used to treat tumors deep within the body, such as brain tumors. heat is applied to the tumor, usually by probes or needles which are inserted into the tumor. The heat source is then inserted into the probe. Invasive interstitial heating technique offer a number of advantages over external heating approaches for localizing heat into small tumors at depth. e. g interstitial technique allows the tumor to be heated to higher temperatures than external techniques. This is why an innovative internal hyperthermia research is being conducted in the design of an implantable microheater [1]. To proceed with this research we need complete and accurate data of the strength, number and location of the micro heaters, which is the objective of this paper. The location, strength, and number of implantable micro heaters for a given tumor size is calculated by solving an Inverse Heat Transfer Problem (IHTP). First we model the direct problem by calculating the transient temperature field via Pennies bioheat transfer equation. A nonlinear least-square method, modified by addition of a regularization term, Levenberg Marquardt method is used to determine the inverse problem [2].

A Heat Transfer Analysis for Passively Cooled “Trumpet” Secondary Concentrators

1987 ◽  
Vol 109 (4) ◽  
pp. 289-297 ◽  
Author(s):  
D. Suresh ◽  
J. O’Gallagher ◽  
R. Winston
Keyword(s):  
Heat Transfer ◽  
Thermal Load ◽  
Flux Distribution ◽  
The Body ◽  
Heat Transfer Analysis ◽  
Normal Operation ◽  
Transfer Model ◽  
Simulation Experiments ◽  
Ray Trace ◽  
Solar Thermal Applications

Some practical questions associated with the use of hyperboloidal “trumpet” shaped terminal concentrators for use in solar thermal applications are addressed. Computer ray-trace calculations show that the flux distribution is strongly peaked over a small neck area at the exit of the trumpet, which will be subjected to a substantial thermal load. A quasi-transient heat transfer model has been developed to analyze the thermal behavior of passively cooled trumpets. The thermal analysis shows that simple techniques exist such that one can design passive secondary trumpets which will remain below safe temperature limits under normal operation for many applications. The wall thickness and its variation along the body of the bell-shaped shell from the exit are found to play an important role in controlling the temperature at all flux levels. As a check on the validity of the model, a set of electrical simulation experiments was conducted and excellent agreement was found.

Linking Energy Levels in the Circadian Core Body Temperature Cycle to Human Health and Well-Being

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Kaufui Vincent Wong
Keyword(s):  
Heat Transfer ◽  
Core Body Temperature ◽  
Energy Levels ◽  
Well Being ◽  
The Body ◽  
Body Core Temperature ◽  
Temperature Cycle ◽  
Body Core ◽  
Core Body ◽  
Health And Well Being

The body core temperature is a measure of the health and well-being of a person. This temperature seldom varies from the average of 37 °C (98.6 °F) and has been used to gage a person’s wellness at any time. The current work reviews the published health and medical works about this topic, focusing on the effects of hypothermia, especially with respect to neurological issues. The controversy still exists, and the jury is out. A heat transfer researcher’s insight foresees the possible results and calls for more research in the field. In addition, a perspective is provided for a couple of traditional “truths” about related topics that have been challenged in recent times.

Temperature Regulated Sleeve for Leg Prosthesis

2019 ◽  
Author(s):  
Rachel Grubbs ◽  
Matthew Yough ◽  
Olivia Rose ◽  
Anthony Lee ◽  
Teresa Sicree ◽  
...  
Keyword(s):  
Heat Transfer ◽  
The Body ◽  
Heating Element ◽  
Heat Transfer Analysis ◽  
Research And Design ◽  
Leg Prosthesis

Abstract This paper presents the findings of the research and design of a heat generating thermal prosthetic sleeve. The goal of the project was to get the sleeve to be designed in a way that keeps a comfortable temperature of the amputation site. Heat transfer analysis as well as comfort tests were used to select the optimal materials for the body of the sleeve. A series of electrical tests using multimeters were used to determine which heating element should be used, as well as in which orientation they should be connected. A microcontroller system had also to be selected to give the sleeve some adjustability.

An Experimental Examination of the Validity of the Commonly Used Methods of Radiant Heat Transfer Analysis

1968 ◽  
Vol 90 (4) ◽  
pp. 429-436 ◽  
Author(s):  
J. R. Schornhorst ◽  
R. Viskanta
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Stainless Steel ◽  
Radiant Heat ◽  
The Body ◽  
Heat Transfer Analysis ◽  
Radiant Heat Transfer ◽  
Local Irradiation ◽  
Experimental Examination ◽  
Predicted Values

In this work the validity and accuracy of the commonly used methods of radiant heat transfer prediction were checked experimentally. The local irradiation was measured for five different materials in two simple configurations. The materials tested were sand-blasted stainless steel, electropolished stainless steel, rough electroplated gold, smooth electroplated gold, and PV100 white paint. Measurements were made over the temperature range from 50 deg F to 850 deg F for each of four sets of geometric parameters. The predicted values of local incident fluxes using the diffuse, specular, and diffuse-specular models were compared with experimental data. The data agree with the diffuse model within the accuracy of the measurements for all the surfaces tested. Additional conclusions, recommendations, and procedures, which should be followed for more realistic radiant heat transfer calculations, are given in the body of the paper.

Conjugate Heat Transfer Analysis and Design Optimization of Internally Cooling Turbine Blade

2011 ◽  
Vol 148-149 ◽  
pp. 862-867
Author(s):  
Mao Hua Qu ◽  
Su Ya Sun ◽  
Ping Xi
Keyword(s):  
Heat Transfer ◽  
Design Optimization ◽  
Turbine Blade ◽  
Conjugate Heat Transfer ◽  
Parametric Modeling ◽  
Heat Transfer Analysis ◽  
Coupled Analysis ◽  
Cooling Efficiency ◽  
Analysis And Design ◽  
Combined Algorithm

To improve the cooling efficiency of turbine blade, a multidisciplinary design optimization (MDO) system involving aerodynamics, heat transfer and structures has been developed. In this system, a MDO procedure for a turbine blade with complicate internal structure is performed. The structural size of rib turbulators, partitions and trailing edge cooling slots, which serve as design variables, is used for parametric modeling of three dimensional turbine blade. Conjugate heat transfer analysis is employed to get the temperature of the blade. The temperature in the blade body obtained from former coupled analysis is specified as boundary conditions for structural analysis. Meanwhile, a combined algorithm of multi-island genetic algorithm (MIGA) and sequential quadratic programming (SQP) is applied for optimization in specified space. While the flow rate of cooling air remains unchanged, the maximum and average temperatures of the blade decrease under the condition of meeting the strength requirement. The result shows that the cooling efficiency of turbine blade is improved, and the system exhibits higher stability, feasibility and efficiency for engineering applications.

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