Numerical simulation of cold air jet attachment to non adiabatic walls

A jet of cold air is denser then ambient air but it adheres to the ceiling of the room over the given distance when it is blown horizontally close to it. Such behaviour of fluid jets is well-known as Coanda effect and it is widely used in practice like in the case of ventilation and air-conditioning of rooms. This phenomenon is not sufficiently known both in terms of mechanism and quantitative effects. The complexity is arising in the case of non-adiabatic ceiling that is common practice in real building structures, since the cold air jet, attachment distance is strongly influenced by heat flux thought the ceiling. The aim of this paper is to propose an algorithm of numerical simulation of fluid flow and heat transfer in the room and ceiling simultaneously, known as conjugate heat transfer problem. Using proposed model, uncertainty of heat transfer coefficient determination is avoided integrating the same general transport equation for fluid flow and heat transfer over the whole computational domain including both air movements in the room and ceiling solids.