hi...

In adiabatic process , no heat crosses the boundaries of the system. Therefore no heat transfer takes place in adiabatic process.

This answer needs to be elaborated with the help of diagrams and unfortunately we cannot draw or attach images or files here. There are various Characteristics that affect the resistance ti heat transfer in refrigerators. They include Refrigerant mass flow rate and refrigerent properties.The heat transfer resistance might change more than 10% in 2 phase region of the evaporator and around 20% in the superheated region. And you also need to take the properties of refrigerant into consideration. We would suggest you to go through this journal for elaborated information https://core.ac.uk/download/pdf/4819047.pdf . This is a thesis submitted on heat transfers in refrigerator condensors and so might help you.

Dear student,

Heat is transferred by direct contact of bodies or substances in conduction.

Conduction means - the transfer of heat between bodies that are in direct contact with each other.

When a substance is heated, the particles will gain more energy, and vibrate more. These molecules collide with other particles and transfer some of their energy to them, by conduction.

Hi,

Your query seems incomplete.

1. The convective heat transfer coefficient in laminar flow over a flat plate a) Increases with distance b) Increases if a higher viscosity fluid is used c) Increases if ...

However the correct answer would be that the convective heat transfer coefficient in laminar flow over a flat plate Increases if a denser fluid is used. This is because it mostly increases if a denser fluid is used.

Hello student,

The question related to correlations for forced convection is that-

Q. The convective heat transfer coefficient in laminar flow over a flat plate;

a) Increases with distance

b) Increases if a higher viscosity fluid is used

c) Increases if a denser fluid is used

d) Decreases with increase in free stream velocity

Ans: The convective heat transfer coefficient in laminar flow over a flat plate increases if a denser fluid is used because it mostly increases if a denser fluid is used.

Hope, you get the answer.

Hi Aspirant ,

The correct answer for the question is OPTION A - 1/5 power of plate length . This is because the average heat transfer co-efficient reduces with length as 1/5th power of length .   For laminar flow over a flat plate, the average value of a Nusselt number is prescribed by the relation
Nu = 0.664 (Re) (Pr)  , the dynamic viscosity has an inverse relation to 1/6 power. To double the convective heat transfer coefficient, the dynamic viscosity has to be decreased 64 times.

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BEST OF LUCK .

Gay-Lussac's Law: The Pressure Temperature Law. This law states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature . With an increase in temperature , the pressure will go up.

hello aspirant,

For an ideal gas, the temperature remains constant because the internal energy only depends on temperature in that case. Since at constant temperature, the entropy is proportional to the volume, the entropy increases in this case, therefore this process is irreversible.  An example of an isobaric system is a gas, being slowly heated or cooled, confined by a piston in a cylinder. The work done by the system in an isobaric process is simply the pressure multiplied by the change in volume, and the P-V graph looks like: Isochoric - the volume is kept constant .

hope this information helps..

all the best for bright future