Acounterflow concentric heat tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. the flow rate of cooling water through the inner tube (di= 2.5 cm) is 0.2 kg/s while the flow rate of oil through the outer annulus (do= 4.5 cm) is 0.1 kg/s. consider the uvalue to be equal to 38.1 w/(m2. k). the oil and water enter at temperatures of 100 and 30oc respectively. how long must the tube be made if the outer temperature of the oil is to be 60oc?

the answer is: they rebelled against saddam hussein’s rule.

kurds opposed saddam rule and wanted independence. kurds in the north and shiites in the south revolt against hussein.

for example, the halabja attack in 1988 conducted against the kurdish people by the iraqi regime under saddam hussein, where between 4000 people are killed and around 9000 are injured.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )