TH-3116 Laminar to Viscous Flow Heat Transfer Apparatus

Experiments

Demonstration of a concentric tube heat exchanger with co-current and counter-current.
Energy balance for the heat exchanger.
Determination of surface heat transfer coefficients on the oil and water sides and determination of the overall heat transfer coefficient.
Relationship between Nusselt Number and Graetz Number for and counter-current flow in laminar/viscous flow and Reynolds Numbers.

Specifications

Bench-top unit:
- aluminium structure and panels in HDF.
- Water Contact Parts are either Copper, Plastic or Stainless Steel.
Electronic Console:
- Sensor digital display for temperature sensors.
- Selector switch for heater range selector.
Pump Controller.
Heater Controller.
Cables and accessories, for normal operation.
Heat exchanger constituted by two concentric tubes with hot oil flowing through the internal tube and cold water flowing through the ring-shaped area.
Exchanger length = 0.92 m.
Internal tube:

Internal diameter: D = 8mm
External diameter: D = 10mm
Length = 1mm
Thickness = 1mm
Heat transfer internal area: A = 02512 m
Heat transfer external area: A = 0314 m

External tube:
- Internal diameter: D = 12mm
- External diameter: D = 16mm
- Length = 1mm
- Thickness = 2mm
Stainless steel heater tank, equipped with:
- Electric Heater.
- Temperature sensor for measure oil temperature.
- PID temperature control.
- Pump suitable for pumping hot oil.
- Flow meter
Temperature sensors:
- Temperature sensor to measure the temperature in the heater tank.
- Temperature sensors to measure the cold water temperature.
- Temperature sensors to measure oil temperature.
Control valves to control cold water and oil flow.
Ball valves that may provide co-current or counter-current flow in the exchanger, according to how they may be set (control of direction of control water flow).

Categories: Mechanical Engineering, Thermodynamics

Description

Description

The Laminar/Viscous Flow Heat Transfer Apparatus is a unit at laboratory scale, designed to study heat transfer between hot oil flowing in laminar flow through an internal tube and cold water that flows through the annulus.

Oil circuit (hot fluid):

The hot oil flows along of a closed circuit. An electric heater, placed into to the heater tank, heating the oil. The oil goes out of the tank and is pumped by the pump. In the inlet of the tank there is a regulation valve for the hot oil. The oil is cooled along of the exchanger and then return to the heater tank, starting a new cycle.

Water circuit (cold fluid):

The cold water comes from the lab water supply. In the water circuit there is a regulation valve and a flow meter. The water comes in to the exchanger, and it increases its temperature. The cold water can come in to the exchanger by both extreme (co-current or counter-current). This depends of the valves position (open or close).

Heat Exchanger:

Hot oil flows through the internal tube and cooling water flows through the annulus between the internal and external tube.

Software TH-3116SW (optional)
DAQ software specially designed in National Instrument™, LABVIEW™ environment to measure and calculate the results of apparatus. The software is optional and while using software a set of electronic sensors are included. Software can be run with any Windows™ environment