A transient three-dimensional heat transfer model of the human body

Ferreira, Maurício Silva; Yanagihara, Jurandir Itizo

doi:10.1016/j.icheatmasstransfer.2009.03.010

Cited by 112 publications

(76 citation statements)

References 23 publications

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“…The destroyed exergy in the processes are It is important to state that if a computational model is used such as in [45], T b may be evaluated as an average temperature, whereas in experimental results, the tympanic or rectal temperature are commonly used as representative of the internal temperature of the body.…”

Section: Thermodynamic Modelmentioning

confidence: 99%

Exergy Analysis of the Musculoskeletal System Efficiency during Aerobic and Anaerobic Activities

Spanghero

Neto

Fernandes

et al. 2018

Entropy

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Abstract:The first and second laws of thermodynamics were applied to the human body in order to evaluate the quality of the energy conversion during muscle activity. Such an implementation represents an important issue in the exergy analysis of the body, because there is a difficulty in the literature in evaluating the performed power in some activities. Hence, to have the performed work as an input in the exergy model, two types of exercises were evaluated: weight lifting and aerobic exercise on a stationary bicycle. To this aim, we performed a study of the aerobic and anaerobic reactions in the muscle cells, aiming at predicting the metabolic efficiency and muscle efficiency during exercises. Physiological data such as oxygen consumption, carbon dioxide production, skin and internal temperatures and performed power were measured. Results indicated that the exergy efficiency was around 4% in the weight lifting, whereas it could reach values as high as 30% for aerobic exercises. It has been shown that the stationary bicycle is a more adequate test for first correlations between exergy and performance indices.

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Section: Thermodynamic Modelmentioning

confidence: 99%

Exergy Analysis of the Musculoskeletal System Efficiency during Aerobic and Anaerobic Activities

Spanghero

Neto

Fernandes

et al. 2018

Entropy

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“…The thermal model of Ferreira and Yanagihara [14] provides the necessary data to fulfill the analysis. [17].…”

Section: Methods 21 Human Bodymentioning

confidence: 99%

“…Exergy analysis was applied in order to better understand the thermoregulatory system adopted in Ferreira and Yanagihara [14] thermal model of the human body. Destroyed exergy and exergy efficiency were calculated as a function of the constants of the control system of the model.…”

Section: Introductionmentioning

confidence: 99%

“…Acclimatization periods are also taken into account by means of hemoglobin concentration. Two models are employed to supply the basic data to the exergy analyses: Ferreira and Yanagihara [14] thermal model of the human body and Albuquerque, Yanagihara and Turri [18] model of the respiratory system. To evaluate the exergy performance of the body as a whole, the model of Mady et al [7] and Mady and Oliveira Junior [19] are adopted.…”

Section: Introductionmentioning

confidence: 99%

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The effect of altitude and intensity of physical activity on the exergy efficiency of respiratory system

Henriques¹,

Mady²,

Neto³

et al. 2014

Int. J. Thermo

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The effect of altitude on exercise performance of lowlanders has long been discussed, but it is still unclear whether the performance reduction is related to inefficiency of the respiratory system, body tissues or both. In the present work, exergy analysis was applied to the human body in order to compare its exergy efficiency under basal conditions and during physical activity at sea level and high altitudes for different periods of acclimatization. Two control volumes were analyzed: respiratory system and human body as a whole. Data concerning mass and energy balances of the body and respiratory system were obtained from models available in the literature, which were modified based on medical literature to simulate the responses to physical activity at high altitude for different periods of acclimatization. The results indicated that the respiratory system exergy efficiency is reduced at high altitudes and under physical activity, while exergy efficiency of the body increases for both parameters, which may indicate that the discomfort reported at high altitudes is mostly related to the respiratory system than to the other ones. Concerning the acclimatization period, its influence was more pronounced on the respiratory system.

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“…This method successfully simplifies the complex structure and thermoregulation mechanism of human. According to the existing literature, this method has been adopted in the field of evaluating hyperthermia and thermal comfort [20,21]. However, only rather limited trials were made in therapeutic hypothermia.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale modeling on human intravascular cooling to induce brain hypothermia via circle of Willis

Xue

Liu

2011

Forsch Ingenieurwes

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Therapeutic hypothermia has been the most effective therapy to treat serious cardiovascular and cerebrovascular diseases. Among them, intravascular cooling is identified as a most efficient approach to induce brain hypothermia. However until now, some key parameters and temperature management method for intravascular cooling are still not well addressed because of the complexity of human thermoregulation mechanism. Aiming at predicting temperature variation of tissues and organs in a more accurate way during therapeutic hypothermia, this study is dedicated to integrate the blood flow model in the circle of Willis together with the compartmental model for characterizing the heat and blood transport throughout the whole human body. According to the theoretical evaluation, the new model could well simulate the temperature response of the whole human body especially the brain under various cooling. Effects of different intervention site and cooling power to the hypothermia performance are discussed, which shows that carotid artery intervention is a more suitable therapeutic hypothermia method in comparison with femoral artery or femoral vein intervention. These results could help design controlling software for intravascular therapeutic hypothermia device in the near future. List of symbols cHeat capacity (kJ/kg K) D Vessel diameter (m) hConvection coefficient (W/m 2 K) Q Flow

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A transient three-dimensional heat transfer model of the human body

Cited by 112 publications

References 23 publications

Exergy Analysis of the Musculoskeletal System Efficiency during Aerobic and Anaerobic Activities

Exergy Analysis of the Musculoskeletal System Efficiency during Aerobic and Anaerobic Activities

The effect of altitude and intensity of physical activity on the exergy efficiency of respiratory system

Multi-scale modeling on human intravascular cooling to induce brain hypothermia via circle of Willis

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