Class 4 (4th Engineer) MEKM 📅 Apr 2023

Exam Question

(a) Sketch and describe a device employed for continuous monitoring of the viscosity of heavy fuel oil being supplied to a main engine (8)

(b) Explain how the system employing the device described in (a) operates to adjust the fuel viscosity.

Reference Answer

### (a) Device for Continuous Monitoring of Fuel Oil Viscosity (Viscotherm)
#### Principle of Operation
A capillary tube type viscotherm operates on the principle of the Hagen-Poiseuille equation for laminar flow, which states that for a given flow rate of a fluid through a capillary tube, the pressure drop across the tube is directly proportional to the dynamic viscosity of the fluid.
$$ \Delta P \propto \mu $$

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