Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Schematic diagram of experimental device. Compressed air was provided by air compressor and stored in a gas reservoir. Following two valves, the thermal mass flow meter was installed. Then the air flow through test section and the pressure of inlet and outlet manifolds were measured.

Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Schematic diagram of test section. The test pieces were sandwiched between up and down fixture. A pressure hole and a thermocouple hole were set close to the inlet of the channels; a pressure hole and five thermocouple holes were set by the outlet. Two holes in the top fixture were for thermocouples and the wires of the heating films.

Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Structure of the copper block and heat device. Considering that the heat conductivity coefficient of copper is high enough, lumped parameter method is suitable for this model to calculate heat flux. The temperature of the copper plate was regarded as uniform. The heating films were power by current heater. The heating film was bonded with copper plates by thermal conductive adhesive closely and covered by asbestos to decrease the heat dissipation. (a) Structure of the copper plate and (b) structure of the heating device. 1: asbestos, 2: heating film, and 3: copper plate.

Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Diagram of test pieces. There are 44 parallel identical circular microchannels in each test pieces. Diameter of each channel is 0.4 mm, horizontal spacing of channels is 0.9 mm.

Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Variations of pressure gradients with different Reynolds number. The pressure drops at inlet and outlet manifolds.

Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Variations of friction factor at different Reynolds number

Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Variations of Poiseuille number at different Reynolds number

Date of download: 3/4/2018 Copyright © ASME. All rights reserved. From: Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths J. Heat Transfer. 2017;139(5):052403-052403-7. doi:10.1115/1.4035589 Figure Legend: Variations of Nusselt number at different Reynolds number. The Nusselt number is an average value.