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Friction factors of power-law fluids in chevron-type plate heat exchangers

In the present work laminar flows of Newtonian and power-law fluids through cross-corrugated chevron-type plate heat exchangers (PHEs) are numerically studied in terms of the geometry of the channels. The plates area enlargement factor was a typical one (1.17), the corrugation angle, β, varied between 30° and 60° and the flow index behaviour, n, between 0.25 and 1. Single friction curves fReg = K for both Newto...

Heat transfer to Newtonian and non-Newtonian fluids in cross-corrugated chevron...

Food fluids are frequently processed in plate heat exchangers (PHEs) and usually behave as non-Newtonian fluids, this behaviour being scarcely considered for PHEs design purposes. Moreover, many food fluids processed in PHEs have a high viscosity and, therefore, data obtained in laminar flow regime is useful to practical applications. The thermal-hydraulic performance of PHEs is strongly dependent on the physic...

Finite-element solutions for laminar flow in sinusoidal corrugated-plate channels

Heat transfer to Newtonian and non-Newtonian fluids in cross-corrugated chevron...

Research on heat transfer of fluids during thermal processing is useful to optimise the heat exchanger design, as well as to define quality levels of processed fluids. In this study, nonisothermal fully developed laminar flows of distinct fluids in different PHEs passages (main heat transfer area) were numerically studied, in order to evaluate the influence of the geometrical properties of the PHE channels and ...

Heat transfer to newtonian and non-newtonian fluids in cross-corrugated chevron...

Laminar flow in chevron-type plate heat exchangers: CFD analysis of tortuosity,...

Liquid foodstuffs with high viscosity are usually processed in plate heat exchangers (PHEs) at laminar or low Reynolds numbers, Re, flows. The tortuosity coefficient is used by the manufacturers for the design and optimization of PHE geometries. Using the finite-element computational fluid dynamics program POLYFLOW®, fully developed laminar flows in double-sine chevron-type PHEs passages are analysed in this wo...

CFD aplicada ao estudo de permutadores de calor de placas chevron

Os fluidos alimentares com viscosidade elevada são frequentemente processados em permutadores de calor de placas (PCPs) em regime laminar. O desempenho termo-hidráulico dos PCPs do tipo chevron depende das características geométricas dos mesmos, nomeadamente do ângulo das corrugações sinusoidais das placas, do espaçamento entre placas e do factor de incremento de área, definido como a razão entre a área real da...

Tortuosidade em permutadores de calor placas

Afectar ao Departamento de Tecnologia Química e Biológica - Docente Ricardo Dias e ao docente Carlos Balsa do Departamento de Matemática ; Utilizando o software comercial de mecânica de fluidos computacional POLYFLOW® estudou-se o escoamento laminar isotérmico de um fluido Newtoniano com propriedades físicas constantes no interior de canais de permutadores de calor de placas corrugadas. Foi estudada a dependên...

Non-Newtonian flows in laminar regime in chevron plate heat exchangers: the inf...

Physical processing brings about irreversible textural and sensorial properties of nearly all the fluids on the food industry. In liquid food processing, plate heat exchangers (PHEs) are commonly used in the heating or cooling stages due to their advantages, such as high efficiency, ease of maintenance and cleaning and flexibility on account of the modular design. Although, laminar or low Reynolds number flows ...

Non-Newtonian flows in laminar regime in chevron plate heat exchangers: the inf...