首页> 外文会议>Proceedings of the ASME international mechanical engineering congress and exposition 2009 >A PASSIVE MODEL OF THE HEAT, OXYGEN AND CARBON DIOXIDE TRANSPORT IN THE HUMAN BODY
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A PASSIVE MODEL OF THE HEAT, OXYGEN AND CARBON DIOXIDE TRANSPORT IN THE HUMAN BODY

机译:人体内热量,氧气和二氧化碳的被动传递模型

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The aim of this work is the development of a mathematical model which integrates a model of the human respiratory system and a model of the human thermal system. Both models were previously developed at the same laboratory, based on classical works. The human body was divided in 15 segments: head, neck, trunk, arms, forearms, hands, thighs, legs and feet. Those segments have the form of a cylinder (circular cross-section) or a parallelogram (hands and feet) with the following tissue layers: muscle, fat, skin, bone, brain, lung, heart and viscera. Two different geometries are used to model the transport of mass and heat in the tissues. For the mass transfer, those layers are considered as tissue compartments. For the heat transfer, the body geometry is taken into account. Each segment contains an arterial and a venous compartment, representing the large vessels. The blood in the small vessels are considered together with the tissues. The gases are transported by the blood dissolved and chemically reacted. Metabolism takes place in the tissues, where oxygen is consumed generating carbon dioxide and heat. In the lungs, mass transfer happens by diffusion between an alveolar compartment and several pulmonary capillaries compartments. The skin exchanges heat with the environment by convection, radiation and evaporation. The differential transport equations were obtained by heat and mass balances. The discretization heat equations were obtained applying the finite volume method. Thernregulation mechanisms were considered as model inputs. The results show three different environment situations. It was concluded that the gas transport is most influenced by the temperature effects on the blood dissociation curves and the metabolism rise in a cold environment by shivering.
机译:这项工作的目的是开发一种数学模型,该模型整合了人类呼吸系统模型和人类热系统模型。两种模型以前都是根据经典作品在同一实验室开发的。人体分为15个部分:头部,颈部,躯干,手臂,前臂,手,大腿,腿和脚。这些部分具有圆柱体(圆形横截面)或平行四边形(手和脚)的形式,具有以下组织层:肌肉,脂肪,皮肤,骨骼,大脑,肺,心脏和内脏。两种不同的几何形状用于模拟组织中质量和热量的传输。对于传质,这些层被视为组织隔室。为了进行热传递,考虑了主体的几何形状。每个部分包含一个代表大血管的动脉腔和一个静脉腔。小血管中的血液与组织一起被考虑。气体通过溶解并发生化学反应的血液运输。代谢发生在组织中,在那里氧气被消耗,产生二氧化碳和热量。在肺中,传质是通过肺泡腔和几个肺毛细血管腔之间的扩散而发生的。皮肤通过对流,辐射和蒸发与环境进行热交换。通过热和质量平衡获得了差分传输方程。应用有限体积法获得了离散热方程。调节机制被认为是模型输入。结果显示了三种不同的环境情况。得出的结论是,气体运输受温度对血液解离曲线的影响最大,并且在寒冷环境中通过发抖,新陈代谢增加。

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