The flow condition of a fluid system when one of the fundamental nondimensional parameters has a critical value, for example, flow of water in an open channel at a Froude number of 1, flow of gas at a Mach number of 1, flow in a pipe at Reynolds number greater than 2100, or shear flow in the atmosphere at Richardson number less than 0.25.
Where did the Vikings come from? The Vikings came from the countries which we know now as Denmark, Norway and Sweden. We refer to the area that these countries are located as Scandinavia. The Vikings lived mainly along the coastlines of these countries or along the rivers which ran into the seas.These are the Vikings that left their lands to explore, invade and settle in other lands, Some Vikings did live further inland but, like most settlements and villages, they were often located near to rivers.he Vikings lived mainly along the coastlines of these countries or along the rivers which ran into the seas. These are the Vikings that left their lands to explore, invade and settle in other lands, Some Vikings did live further inland but, like most settlements and villages, they were often located near to rivers.
The period referred to as the Viking Age dates from around AD 800 to 1050. The homelands of the Vikings were in Scandinavia, but the countries of Scandinavia as we know them today did not exist until the end of the Viking Age.Wherever they lived, the Viking-age Scandinavians shared common features such as house forms, jewellery, tools and other everyday equipment.rading Across the Globe. The Vikings created a trade network that spanned the globe as far east as the River Volga and Byzantium (Istanbul), west to Dublin and Newfoundland, and north to Greenland and the North Cape.