Development of a sensor for liquid film thickness measurements during annular flow in microchannels

Autor(es)

Baptistella, Victor Eduardo Corte ; Guo, Zhaorui ; Lee, Minhyeok ; Ribatski, Gherhardt ; Suzuki, Yuji

• Tipo de documento: Artigo Científico
• Fonte: EXPERIMENTS IN FLUIDS; v. 65, n. 11, p. 12-pg., 2024-11-01.

Resumo

A conductance-based sensor to measure liquid film thickness during annular two-phase flows in microchannels has been developed in the present study. The liquid film plays an important role on the characterization of two-phase annular flows. The mean thickness and the presence of interfacial waves influence the heat transfer rate, critical heat flux and pressure drop. The proposed sensor has a ring-shaped design and targets the measurement of films thinner than 50 mu m in order to provide detailed information on the liquid film behavior during wall dryout events. It is fabricated on a TEMPAX wafer with micro-electro-mechanical systems (MEMS) technologies. The performance of the prototype device is assessed by using aqueous solutions of known conductivity and imposing liquid films with prescribed thicknesses above the sensor. The effects of the geometrical parameters on the sensor behavior are discussed with the aid of numerical simulation and experimental results. It is found that increasing the size of the electrodes increases the measured electrical signals, while increasing the spacing between the electrodes decreases the measured signal. (AU)

• Processo FAPESP: 20/10923-2 - Avaliação do comportamento hidrodinâmico e dos mecanismos de transferência de calor durante a ebulição convectiva em microcanais em condições de secagem de parede
• Beneficiário: Victor Eduardo Corte Baptistella
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 16/09509-1 - Processos de transferência de calor com mudança de fase de elevado desempenho aplicados ao aproveitamento de energia solar
• Beneficiário: Gherhardt Ribatski
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 21/13161-9 - Integração de microssensores de espessura de filme, termopares e aquecedores de filme fino para investigações de escoamentos anulares em microcanais
• Beneficiário: Victor Eduardo Corte Baptistella
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto