The phrase "and returns back" is not correct in written English due to redundancy.
You can use it in informal contexts, but it is better to avoid it in formal writing.
Example: "He went to the store and returns back with groceries."
Alternatives: "and returns" or "and comes back".
This is cooled down in a heat exchanger and returns back to Calandria, completing a natural circulation loop.
Pip in the meantime travels overseas and returns back after 11-years.
The hot heavy-water moderator inside the Calandria rises upward due to buoyancy, cooled in a shell and tube heat exchanger (located within the loop) and returns back to the Calandria, completing a natural circulation loop.
Before long, the team could pinpoint the cost of every process performed for every customer and could trace revenue deductions — discounts, allowances, promotions, and returns — back to individual customers.
The heated heavy-water moderator (due to heat transferred from the Main Heat Transport System (MHTS) and thermalization of neutrons and gamma from radioactive decay of fuel) rises upward due to buoyancy, gets cooled down in a heat exchanger and returns back to Calandria, completing a natural circulation loop.
Remote sensors include passive systems (instruments that receive information naturally emitted from a region in the atmosphere) and active systems (instruments that emit either acoustic or electromagnetic energy and record the characteristics of this energy after it reflects off an object or surface and returns back to the sensor).
Hayabusa2 will reach the C-type asteroid 162173 Ryugu in 2018, and return back to the Earth in 2020.
Hayabusa2 will reach the C-type asteroid 1999 JU3 in 2018, and return back to the Earth in 2020.
It was shown that electrogenic activity decreased by a half at 40 °C and returned back to the initial value under gradual cooling.
For example, the desert ant Cataglyphis is able to explore its desert habitat for hundreds of meters while foraging and return back to its nest precisely and on a straight line.
And then extending the left arm and right leg and holding that for about five seconds and returning back to start.
