Search results for "Convective transport"
showing 2 items of 2 documents
Computational fluid dynamics and its application to transport processes
2007
Fluid transport behaviour is of great importance within the chemical process industry and in biotechnology. The complexity of this behaviour, reflected in the nature of the fundamental partial differential equations which describe it analytically, means that it has to be treated by numerical methods. In this paper the basic equations are given, and the approaches necessary to treat laminar and turbulent flows are carefully explained. As digital computers have increased in size, so has the comprehensiveness of the problems which can be treated, and the development of typical computer programs is described. Problems of accuracy and experimental validation are also surveyed, and it is shown th…
Direct Measurement of Reoxygenation in Malignant Mammary Tumors after a Single Large Dose of Irradiation
1984
Due to functional and morphological abnormalities of the terminal vascular bed in malignant tumors, a severe restriction of convective transport occurs even in very early growth stages. This leads to nutritional deprivation of the cancer cells and to unfavourable cellular microenvironments as well. During advanced tumor growth stages, the nutritional deprivation and the milieu conditions get worse because pronounced deterioration of diffusive transport is superimposed on the insufficient blood supply. This transport limitation is mainly caused by increases of intercapillary distances and by decreases of vascular surface areas per unit tissue volume. Moreover, these peculiarities of the tumo…