An electrical connector includes a main body portion, connection portions, a first temperature sensing element and a second temperature sensing element. The connection portions allow the main body portion to be electrically connected to a charged element provided in a flow channel. The main body portion includes a first side and a second side which are parallel to a flow direction of fluid. The first temperature sensing element and the second temperature sensing element are provided at mutually opposite positions on the first side and the second side in an electrically insulated manner. A fluid state test device having the electrical connector and a fluid heat exchange system are further provided. Thus, the original flow field where the electrical connector of the electrode of the electric heater is located may not change, and destruction to the flow field is avoided.

An electrical connector includes a main body portion, connection portions, a first temperature sensing element and a second temperature sensing element. The connection portions allow the main body portion to be electrically connected to a charged element provided in a flow channel. The main body portion includes a first side and a second side which are parallel to a flow direction of fluid. The first temperature sensing element and the second temperature sensing element are provided at mutually opposite positions on the first side and the second side in an electrically insulated manner. A fluid state test device having the electrical connector and a fluid heat exchange system are further provided. Thus, the original flow field where the electrical connector of the electrode of the electric heater is located may not change, and destruction to the flow field is avoided.

A viscosity measuring system is equipped with a tank, a flow pathway, an external force applying unit, and a pump. The viscosity measuring system further comprises a first pressure detection unit which detects a pressure of the electrode ink, and a second pressure detection unit which detects the pressure of the electrode ink on a more downstream side than the first pressure detection unit. A detection processing unit calculates a viscosity of the electrode ink based on the pressure detected by the first pressure detection unit and the pressure detected by the second pressure detection unit.

A viscosity measuring system is equipped with a tank, a flow pathway, an external force applying unit, and a pump. The viscosity measuring system further comprises a first pressure detection unit which detects a pressure of the electrode ink, and a second pressure detection unit which detects the pressure of the electrode ink on a more downstream side than the first pressure detection unit. A detection processing unit calculates a viscosity of the electrode ink based on the pressure detected by the first pressure detection unit and the pressure detected by the second pressure detection unit.

A device for determining the rheological properties of blood may include a channel having at least one channel sub-section that has a substantially constant cross-section; apparatus for determining a pressure differential along at least a portion of the sub-section of the channel; a first reservoir that is adapted to be located at a first end of the channel and to be placed in fluid communication with the channel, the first reservoir being of variable internal volume; a second reservoir that is adapted to be placed in fluid communication with first reservoir via the channel, the second reservoir being of variable internal volume; means for allowing blood to be introduced into the device; an outlet for allowing gas to be expelled from the device; and means for varying the volume of the first reservoir.

A device for determining the rheological properties of blood may include a channel having at least one channel sub-section that has a substantially constant cross-section; apparatus for determining a pressure differential along at least a portion of the sub-section of the channel; a first reservoir that is adapted to be located at a first end of the channel and to be placed in fluid communication with the channel, the first reservoir being of variable internal volume; a second reservoir that is adapted to be placed in fluid communication with first reservoir via the channel, the second reservoir being of variable internal volume; means for allowing blood to be introduced into the device; an outlet for allowing gas to be expelled from the device; and means for varying the volume of the first reservoir.

Systems and methods for determining fluid rheological characteristics of a fluid used in a subsurface operation are provided. The methods include measuring temperature, pressure, and at least one of a flow rate and a flow velocity of the fluid in a first fluid circuit. A model is based on the temperature, the pressures, and the flow rate or flow velocity. The fluid rheological characteristic of the fluid in a second fluid circuit is determined by measuring a temperature and flow rate and/or flow velocity in the second fluid circuit. The rheological characteristic of the fluid is calculated based on the model employing the temperature and the flow rate/flow velocity of the second fluid circuit.

Systems and methods for determining fluid rheological characteristics of a fluid used in a subsurface operation are provided. The methods include measuring temperature, pressure, and at least one of a flow rate and a flow velocity of the fluid in a first fluid circuit. A model is based on the temperature, the pressures, and the flow rate or flow velocity. The fluid rheological characteristic of the fluid in a second fluid circuit is determined by measuring a temperature and flow rate and/or flow velocity in the second fluid circuit. The rheological characteristic of the fluid is calculated based on the model employing the temperature and the flow rate/flow velocity of the second fluid circuit.

A method includes directing a wellbore fluid into a flow control assembly coupled to a completion string positioned within a wellbore, the flow control assembly including at least a first fluidic device defining a flow passage, where the flow passage is formed of a material having a known wettability selected to correspond to a component of the wellbore fluid. The pressure change along the flow passage is measured and utilized to determine fluid cut based on a predetermined correspondence between pressure change and component cut for the first fluidic device. Multiple fluidic devices, each selected to have a wettability responsive to a different component of the wellbore fluid, may be aligned in parallel or series to determine the cut of multiple components in the fluid.

A method includes directing a wellbore fluid into a flow control assembly coupled to a completion string positioned within a wellbore, the flow control assembly including at least a first fluidic device defining a flow passage, where the flow passage is formed of a material having a known wettability selected to correspond to a component of the wellbore fluid. The pressure change along the flow passage is measured and utilized to determine fluid cut based on a predetermined correspondence between pressure change and component cut for the first fluidic device. Multiple fluidic devices, each selected to have a wettability responsive to a different component of the wellbore fluid, may be aligned in parallel or series to determine the cut of multiple components in the fluid.