International Journal of Innovation Engineering and Science Research (ISSN: 2581-4591) www.ijiesr.com Volume 4 Issue 5 September-October 2020 10|Page ABSTRACT MatrixRotation Range of Rotary Regenerators for Good Heat Transfer and Acceptable Fluid CarryoverLeakage Paulo Cesar Mioralli, Guilherme Lanzi Ernandes, Elson Avallone, Paulo Henrique Palota,Claiton Eduardo Luizete, Pablo Sampaio Gomes Natividade Department of Industry Federal Institute of São Paulo – IFSP Catanduva-SP, Brazil Three typical rotary regenerators with both streams under the laminar flow regime are computationally analyzed from changes in matrix rotation. The mass flow rate, the inlet temperatures of gas streams and the geometric dimensions of the regenerators were fixed in the analysis. The ratio of residence time  of flow on each side of the equipment to the time  required for a complete matrix rotation is calculated for the regenerators, representing the fluid carryover leakage. The convective heat transfer coefficient is obtained from correlation. The heat transfer rate is determined using the Effectiveness-NTU method specific to rotary regenerators. Ranges of the matrix rotation values and the ratio     that provide good heat transfer rate and acceptable fluid carryover are chosen for each investigated equipment. Additionally, an analysis of the regenerator effectiveness as function of the time required for a complete matrix rotation is presented. The results reveal that the chosen matrix rotation ranges shorten as the size of the rotary regenerator increases and the limit levels of the chosen matrix rotation decrease as the dimensions and typical operating conditions of the rotary regenerators increase. Keywords—rotary regenerator; matrix rotation; carryover leakage; computational analysis. NOMENCLATURE A free flow cross-sectional area, 2 m m A matrix cross-sectional area, 2 m T A total cross-sectional frontal area   m A A  , 2 m tr A heat exchange area, 2 m C heat capacity rate of fluids, K W r C matrix heat capacity rate, K W * r C matrix heat capacity rate ratio on the cold or hot side p c specific heat of gas under constant pressure, K kg J m c specific heat of matrix, K kg J h D hydraulic diameter, m e thickness of the plates that constitute the matrix channels, m h convective heat transfer coefficient, K m W 2 k thermal conductivity, mK W L length of matrix, m m  gas mass flow rate, s kg m m mass of matrix, kg n rotational speed, rpm NTU number of heat transfer units on the cold or hot side Nu Nusselt number P periphery of the channel, m Pr Prandtl number Q heat transfer rate, W Re Reynolds number h r hydraulic radius   4 D h , m T temperature, K 0 t time required for a complete matrix rotation, s res t residence time, s u fluid velocity in the channel, s m Greek Symbols μ dynamic viscosity, 2 m Ns 0 ε effectiveness of counterflow heat exchanger r ε regenerator effectiveness r  correction factor ρ fluid density, 3 m kg ζ porosity Subscripts i inlet o outlet c cold h hot min minimum max maximum